NewHVAC Technician Marriott International, IncHVAC TechnicianAndover, MA$40.90Act as a technical resource for locations regarding corrective, preventative, and/or routine repair and maintenance procedures and techniques such as, but not limited to: HVAC/refrigeration, kitchen equipment, laundry equipment, electrical systems, boilers and hot water systems, and life safety systems. Related Work Experience: Three years’ experience in: heating, ventilation, air conditioning, and refrigeration, electrical, mechanical, and plumbing, and pneumatic/electronic systems and controls.
NewMaintenance Technician-2 Positions open Bethany Community Services IncMaintenance Technician-2 Positions openHaverhill, MA$29–$30Full timeDiagnose and repair issues across various systems and areas, including HVAC, electrical, plumbing, major appliances, carpentry, emergency systems, flooring, hardware accessories, masonry, painting/wallpaper, and water features such as pools and spas. Join Bethany Community Services as a Maintenance Technician and become a vital part of our dedicated team committed to maintaining a safe, functional, and welcoming environment for our community.
Building Automation Service Technician JobotBuilding Automation Service TechnicianBoston, MA$35–$55 / hourInformation collected and processed as part of your Jobot candidate profile, and any job applications, resumes, or other information you choose to submit is subject to Jobot's Privacy Policy, as well as the Jobot California Worker Privacy Notice and Jobot Notice Regarding Automated Employment Decision Tools which are available at jobot.com/legal. This role supports commercial and institutional clients by ensuring their building automation systems (BAS) and connected HVAC equipment operate reliably and efficiently.
Field Maintenance Technician II - Restaurant Equipment cumberlandfarmsincField Maintenance Technician II - Restaurant EquipmentNASHUA, NH$22.25–$29.67You can find us operating under the following store banners: Certified Oil, Cumberland Farms, Fastrac, Kwik Shop, Loaf N Jug, Minit Mart, Sprint Food Stores, Tom Thumb, Turkey Hill, and Quik Stop. If you have a passion for delivering exceptional results, thrive in a fast-paced corporate environment, and bring experience in business management or related areas, we'd love to meet you - even if you don't meet every single requirement.
Senior Refrigeration Service Technician - Commercial & Industrial CoolSysSenior Refrigeration Service Technician - Commercial & IndustrialBoston, MA$30–$50Provides service to the customer base by repairing and overhauling equipment, such as compressors, water pumps, air handlers, and electrical and mechanical control devices in a safe, efficient, and timely manner that exceeds customers’ expectations. Provides general repair work on refrigeration, heating, and ventilation equipment, such as air conditioning units, evaporative condensers, ice machine equipment, water pumps, gas furnaces, compressors, and electric motors in a safe and timely manner.
NewRefrigeration Service Technician 2 - Commercial & Industrial CoolSysRefrigeration Service Technician 2 - Commercial & IndustrialBoston, MAProvide general repair work on refrigeration, heating and ventilation equipment such as air conditioning units, evaporative condensers, ice machine equipment, water pumps, gas furnaces, compressors and electric motors. Employees are regularly required to walk and stand for long periods, hear, drive, sit, bend, kneel, stoop, crouch, crawl, climb, use hands and fingers, and lift and/or move up to 25 pounds, occasionally up to 50 pounds.
General Maintenance Technician - Intermediate cumberlandfarmsincGeneral Maintenance Technician - IntermediateLAWRENCE, MA$24.63–$32.84You can find us operating under the following store banners: Certified Oil, Cumberland Farms, Fastrac, Kwik Shop, Loaf N Jug, Minit Mart, Sprint Food Stores, Tom Thumb, Turkey Hill, and Quik Stop. If you have a passion for delivering exceptional results, thrive in a fast-paced corporate environment, and bring experience in business management or related areas, we'd love to meet you - even if you don't meet every single requirement.
Body Shop Technician I PenskeBody Shop Technician IHudson, NHFull timeDuties may include the overhaul, adjustment, replacement and repair of all series of motor truck and trailer equipment including, but not limited to the following: Cab/ Sheet Metal Repair, Fiberglass Repair, Composite Bonding/ Repair, Welding/ Fabricating, Frame Straightening/ Alignment, Suspension Repair/ Alignment, Box Repair/ Replacement, Air Conditioning Systems, Electrical/ Brake/Cooling Systems, Surface Preparation, and Paint/ Mixing/ Tinting/ Blending. As an experienced Body Shop Technician with Penske, you’ll use industry-leading technology and repair techniques – plus cutting-edge diagnostic equipment – to get our customers' state-of-the-art vehicles back up and running in high-quality condition.
NewFull Time Evening Security & Maintenance Technician RiverWoods ExeterFull Time Evening Security & Maintenance TechnicianExeter, NHRiverWoods in Exeter is currently seeking a full time Evening (2pm to Midnight) staff member to join our team on for Security & Maintenance work and help provide excellent and quality customer service in support of our residents and community. Each member of our team plays a critical role in achieving our mission: to create community and provide peace of mind to our residents.
NewChimney Sweep Vaco LLCChimney SweepNatick, MA$100,000–$200,000 / yearDetermining compensation for this role (and others) at Vaco by Highspring depends upon a wide array of factors including but not limited to: the individual’s skill sets, experience and training; licensure and certification requirements; office location and other geographic considerations; other business and organizational needs. Determining compensation for this role (and others) at Vaco/Highspring depends upon a wide array of factors including but not limited to the individual’s skill sets, experience and training, licensure and certifications, office location and other geographic considerations, as well as other business and organizational needs.
HVAC Service Technician Davron LLCHVAC Service TechnicianEssex, MALEAD HVAC SERVICE TECHNICIAN | HVAC TECHNICIAN | HVAC/R TECHNICIAN | HVAC SERVICE TECH | EPA UNIVERSAL | HEAT PUMPS | MINI-SPLITS | FURNACES | AIR CONDITIONING | BOILERS | RESIDENTIAL HVAC | LIGHT COMMERCIAL HVAC . This company specializes primarily in residential HVAC service with light commercial work, focusing heavily on heat pumps and mini-splits while also servicing conventional systems such as furnaces, air conditioning, and boilers.
Supermarket Rack Refrigeration Hvac Technician WalmartSupermarket Rack Refrigeration Hvac TechnicianSalem, NHFull timeAs a Supermarket Rack Refrigeration HVAC Technician at our local retail store, your role will support and oversee repair within the Walmart facilities Refrigeration HVAC equipment team and assets by utilizing commercial HVAC and Refrigeration skills and using hand tools, digital tools, power tools, and other equipment to complete jobs. Maintain and repair Walmart facility's Refrigeration HVAC equipment and assets by utilizing commercial HVAC and Refrigeration skills and using hand tools, digital tools, power tools, and other equipment to complete jobs.
Senior Technician, Refrigeration/HVAC Walmart IncSenior Technician, Refrigeration/HVACSALEM, NH$29–$56 / hourAs a Senior Supermarket Rack Refrigeration HVAC Technician at our local retail store, your role will support and oversee repair within the Walmart facilities Refrigeration HVAC equipment team and assets by utilizing commercial HVAC and Refrigeration skills and using hand tools, digital tools, power tools, and other equipment to complete jobs. Job Duties: Maintain and repair Walmart facility's Refrigeration HVAC equipment and assets by utilizing commercial HVAC and Refrigeration skills and using hand tools, digital tools, power tools, and other equipment to complete jobs.
HVAC Technician Haverhill Public SchoolsHVAC TechnicianHaverhill, Massachusetts$80,000–$90,000Title of Position: HVAC Technician Work Year: 12 MONTHS Effective Dateof Employment: 2026 - 2027 School Year Salary: $80,000 to $90,000 Organizational Relationship or Line of Authority: Directly responsible to the Director of Facilities and/or his/her designee in all matters pertaining to the building. Comprehensive knowledge of operational, maintenance, and repair procedures of heating, ventilating, cooling system controls; water service and plumbing; electrical, lighting and communication systems; motor vehicles; and other equipment within the school department.
HVAC Technician Service and Maintenance The Blue Collar RecruiterHVAC Technician Service and MaintenanceBoston, MassachusettsEssential Job Functions: Perform comprehensive preventative maintenance on residential air conditioning and heating systems. Position Summary: Our Newton based residential HVAC company is hiring a full time HVAC Technician to focus on service and maintenance.
HVAC Lead Service Technician Blue Collar ServicesHVAC Lead Service TechnicianNewton, MA$33–$44 / hourIf you check your ego at the door, love helping others, and are always looking for ways to improve your craft, you will fit right in. Handle the administrative side seamlessly, including ordering job stock and managing billing.
HVAC Service - Maintenance Technician Townsend EnergyHVAC Service - Maintenance TechnicianManchester, NH$32–$50 / hourFull timeFounded in 1931, we are the local name you can depend on for energy and HVAC for residential and light commercial heating and cooling needs. Troubleshooting, diagnostics, service, repair, and maintenance of residential and light commercial HVAC equipment.
Licensed HVAC Technician Cushman & WakefieldLicensed HVAC TechnicianBoston, MassachusettsIn addition to a comprehensive benefits package, Cushman and Wakefield provide eligible employees with competitive pay, which may vary depending on eligibility factors such as geographic location, date of hire, total hours worked, job type, business line, and applicability of collective bargaining agreements. Cushman & Wakefield also provides eligible employees with an opportunity to enroll in a variety of benefit programs, generally including health, vision, and dental insurance, flexible spending accounts, health savings accounts, retirement savings plans, life, and disability insurance programs, and paid and unpaid time away from work.
Residential HVAC Maintenance Technician Heritage Home ServiceResidential HVAC Maintenance TechnicianNorth Hampton, New HampshireFull timeOverview: Join the Heritage Home Service team as a Residential HVAC Maintenance Technician at our North Hampton, NH location . Take-home truck, fuel card, tool allowance, uniforms, phone, and tablet provided for your convenience.
HVAC Controls - Sr Field Service Technician Honeywell International IncHVAC Controls - Sr Field Service TechnicianCanton, MA$28–$42 / hourAs a trusted partner, we provide actionable solutions and innovation through our Aerospace Technologies, Building Automation, Energy and Sustainability Solutions, and Industrial Automation business segments - powered by our Honeywell Forge software - that help make the world smarter, safer and more sustainable. BA products and services include advanced software applications for building control and optimization; sensors, switches, control systems, and instruments for energy management; access control; video surveillance; fire products; and installation, maintenance, and upgrades of systems.
HVAC Technician Whitney HoldingsHVAC TechnicianLowell, MassachusettsWhitney Services employs plumbers , electrical contractors, HVAC technicians, and drain cleaning professionals to better serve customers throughout Michigan, Indiana, Ohio & Florida. Proven track record in soldering, pipe threading, brazing, furnace and air conditioning service as well as installation, gas leak testing and repair.
HVAC Technician- 40 Hours 7:00 AM- 3:30 PM Lahey Hospital and Medical CenterHVAC Technician- 40 Hours 7:00 AM- 3:30 PMCambridge, MA$30–$41 / hourMaintains high-pressure boilers of various horsepower and such auxiliary equipment as air conditioner chillers, air compressors, and generators to provide steam, electric power, and auxiliary services. Working conditions include; exposure to typical boiler room elements including heat, steam, hot water, oil and grease, etc., with frequent exposure to adverse conditions.
HVAC Technician - Curry College Curry CollegeHVAC Technician - Curry CollegeMilton, MAAssist with design of plumbing and heating systems for new buildings, and modification and rep. more.
HVAC Technician RTX CorpHVAC TechnicianAndover, MAThis includes recovery and reclaim, refrigerant manifolds, pressure regulators, vacuum pumps, oil pumps, digital scales, psychrometer, thermal imaging, electric drills, pipe and thread cutting equipment, wheel pullers, soldering, step ladders and extension ladders, pry bars, bending and flaring tools, and other related tools. This includes, but is not limited to, installation and modification to HVAC related piping, rooftop units, chillers, pumps, motors, belts, pulleys, shives, bearings, air filters, compressors, valves, split systems, cooling towers, humidity controls, DDC and pneumatic controls, and heating/cooling load calculations.
HVAC Service Technician - 2812 Boddie-Noell EnterprisesHVAC Service Technician - 2812South Boston, MassachusettsRepairs include but are not limited to restaurant and commercial cooking equipment, ice/beverage equipment, refrigeration equipment, building control systems, exhaust and fresh air systems, drive-thru audio systems, HVAC systems, minor electrical systems and circuits, minor plumbing systems including hot water heaters, and minor building repairs. NOW HIRING - Facilities Management Service Technicians - Our Facilities Management Service Technician plays an important role at Boddie-Noell facilities including our Hardee's restaurants.
HVAC Service Technician Townsend EnergyHVAC Service TechnicianDanvers, MA$38–$50 / hourFull timeExperience service /maintenance/ troubleshooting / repairing, a wide range of residential and light commercial equipment including oil & propane. We value our employees and offer growth and versatility in your career by providing cross training in other fields and education and licensing programs.
HVAC Install Technician Village Services CorporationHVAC Install TechnicianChelmsford, MAFull timeIn this role, you will be responsible for the replacement of existing HVAC units or installing brand new units, ductwork insulation and ensuring proper ventilation in customer homes. Village Home Services is looking to hire a full-time HVAC/Sheet Metal Install Technician in Chelmsford, MA.
HVAC Technician - Chilled Water Plant MIT Lincoln LaboratoryHVAC Technician - Chilled Water PlantLexington, MAOperate and maintain a semi-automated Chilled Water Plant utilizing York Turbomaster Chillers and associated pumps, valves, cooling towers, strainers, water treatment systems, control systems, and low-pressure steam systems. The final salary offered to a selected candidate will depend on various factors, including—but not limited to—the scope and responsibilities of the role, the candidate’s experience, skills and education/training, internal equity considerations and applicable legal requirements.
HVAC Technician TRUMAN REFRIGERATION INCHVAC TechnicianMedford, MARepair or service heating, ventilating, and air conditioning (HVAC) systems to improve efficiency, such as by changing filters, cleaning ducts, or refilling non-toxic refrigerants. In this role, you will install, service, or repair heating and air conditioning systems in residences or commercial establishments.
Residential HVAC Service Technician GpacResidential HVAC Service TechnicianBoston, MA65000–78000GPAC (Growing People and Companies) is an award-winning search firm specializing in placing quality professionals within multiple industries across the United States since 1990. We are extremely competitive, client-focused and realize that our value is in our ability to deliver the right solutions at the right time.
Commercial HVAC Service Technician CaptiveAire SystemsCommercial HVAC Service TechnicianBoston, MAPosition Summary: Seeking a driven and motivated HVAC Technician to join our service team focusing on commissioning, repairing, and maintaining our equipment. Nation's leading manufacturer of commercial kitchen ventilation systems, and now offering a complete solution of fans, heaters, ductwork and HVAC equipment.
NewHVAC Technician or Mechanic 3rd Shift, Monday-Friday, 11pm-7:30am(11pm Sunday start) Boston CollegeHVAC Technician or Mechanic 3rd Shift, Monday-Friday, 11pm-7:30am(11pm Sunday start)MADaily tasks include but not limited to: preventative and reactive maintenance/repairs on air handler units (AHU), circulator pumps, split HVAC systems, cooling towers and fan coil units. Under the direct supervision of the HVAC Shop Supervisor, or other designated personnel, the HVAC Technician performs skilled work in the maintenance and repair of refrigeration, heating, ventilating, and air conditioning systems, and their controls.
HVAC Technician Pearce ServicesHVAC TechnicianFramingham, MA$24–$43 / hourPearce provides technical maintenance, repair, operations, and engineering services for uninterruptible power supply (UPS) systems, backup power generators, battery energy storage systems (BESS), critical cooling systems, and other electrical and mechanical infrastructure across end markets such as renewable energy, telecom, and data centers. Founded in 1998, Pearce has more than 4,000 employees and 28 locations across the U.S. Pearce is a wholly owned subsidiary of CBRE Group, Inc., the world's largest commercial real estate services and investment firm.
Qualified HVAC Technician w/ 5+ Years Experience Bedford Mechanical IncQualified HVAC Technician w/ 5+ Years ExperienceBedford, MARepair or service heating, ventilating, and air conditioning (HVAC) systems to improve efficiency, such as by changing filters, cleaning ducts, or refilling non-toxic refrigerants. In this role, you will install, service, or repair heating and air conditioning systems in residences or commercial establishments.
HVAC Technician - Chilled Water Plant Lincoln LaboratoryHVAC Technician - Chilled Water PlantLexington, MAOperate and maintain a semi-automated Chilled Water Plant utilizing York Turbomaster Chillers and associated pumps, valves, cooling towers, strainers, water treatment systems, control systems, and low-pressure steam systems. The final salary offered to a selected candidate will depend on various factors, including-but not limited to-the scope and responsibilities of the role, the candidate's experience, skills and education/training, internal equity considerations and applicable legal requirements.
Commercial Hvac Technician Carlson Hvac, IncCommercial Hvac TechnicianBillerica, MARepair or service heating, ventilating, and air conditioning (HVAC) systems to improve efficiency, such as by changing filters, cleaning ducts, or refilling non-toxic refrigerants. In this role, you will install, service, or repair heating and air conditioning systems in commercial establishments.
Faclities HVAC Technician, 1st shift, $3k sign on bonus! Entegris IncFaclities HVAC Technician, 1st shift, $3k sign on bonus!Billerica, MA$40–$50 / hourThis role is responsible for maintaining, troubleshooting, and optimizing HVAC and plant utility systems that support stringent environmental, chemical, and process requirements. Job Description: Position Summary: Entegris is seeking a highly skilled HVAC / Mechanical Technician to support critical facility systems in a cleanroom manufacturing environment.
HVAC Technician Rockstar RecruitingHVAC TechnicianBoston, MassachusettsCompany Vehicle: Take-home van with a gas card — skip the wear and tear on your ride. Drive company vehicle to job sites for service calls and installations.
HVAC Refrigeration Technician 1st Shift GE Aerospace.HVAC Refrigeration Technician 1st ShiftLynn, MAEssential Responsibilities: Maintain, repair and complete preventative maintenance on various types of HVAC equipment including but not limited to: rooftop units, cooled chilled water systems, split systems, cooling towers, air handlers and pneumatic controls. In this role, you will be maintaining and repairing our HVAC systems throughout the site, conducting preventative maintenance on various refrigeration units, and installing HVAC systems and equipment in the facility.
HVAC Technician / Installer Davron LLCHVAC Technician / InstallerBoston, MAHVAC SERVICE TECHNICIAN / INSTALLER | EPA CERTIFICATION | JOURNEYMEN-LEVEL TECHNICIANS | STATE HVAC LICENSE | DRIVER'S LICENSE | ON-CALL SCHEDULE | RESIDENTIAL HVAC | COMMERCIAL HVAC | DIAGNOSE | REPAIR | INSTALL | CUSTOMER SERVICE . Build your future with a fast-moving HVAC service team serving the Boston-to-Providence market, delivering exceptional customer care and high-quality residential solutions while expanding commercial work.
HVAC TECHNICIAN - DEPT. OF PUBLIC WORKS City of Manchester NHHVAC TECHNICIAN - DEPT. OF PUBLIC WORKSManchester, NH$30.54–$43.55 / hourEXAMPLES OF ESSENTIAL WORK: Repairs all air conditioning, heating, ventilation, refrigeration, boilers and periphery systems within municipal buildings and public utility areas; Answers service calls as needed; Troubleshoots and diagnoses equipment during malfunctions and replaces/repairs parts as necessary; Coordinates the installation of new HVAC equipment; Trains other building maintenance staff in the diagnosing and/or repair of routine functions within HVAC systems; Installs portable equipment, including heating appliances, ventilating equipment, cooling units or evaporative coolers, closed steam systems or hot or chilled water piping within heating and cooling equipment and related component equipment; Operates boiler system to maintain proper water temperature for the production of methane gas and the operation of the boiler system; Performs preventative maintenance and proper lubrication of all equipment; Monitors, repairs, and installs pneumatic, electrical and electronic controls to ensure proper operation; Performs diagnostic tests on all assigned systems; Orders parts as needed to complete service calls; Meets with vendors as needed; Assists with snow removal when needed; Provides guidance and demonstrations to new employees in similar positions; Keeps supervisors informed of work progress, issues, and potential solutions; Attends meetings and training to stay current on relevant practices and developments; Responds to citizen inquiries courteously and promptly; Coordinates regularly with others to enhance interdepartmental efficiency; and. REQUIRED KNOWLEDGE SKILLS AND ABILITIES: Thorough knowledge of HVAC systems, including testing, installation, repair and maintenance; Thorough knowledge of local, State, and Federal codes relating to the operation and replacement of heating, ventilation and refrigeration systems; Thorough knowledge of the operation and maintenance of boilers; Skill in the installation, repair, and maintenance of HVAC systems; Ability to communicate effectively with others, both orally and in writing, using both technical and non-technical language; Ability to understand and follow oral and/or written policies, procedures and instructions; Ability to use logical and creative thought processes to develop solutions according to written specifications and/or oral instructions; Ability to perform a wide variety of duties and responsibilities with accuracy and speed under the pressure of time-sensitive deadlines; Ability and willingness to quickly learn and put to use new skills and knowledge brought about by rapidly changing information and/or technology; Integrity, ingenuity and inventiveness in the performance of assigned tasks.
Residential HVAC Service Technician Heritage Home ServiceResidential HVAC Service TechnicianNorth Hampton, New HampshireFull timeOverview: Join the Heritage Home Service team as a Residential HVAC Service Technician at our North Hampton, NH location . 2- 3 years of proven experience as an HVAC Service or Maintenance Technician with strong technical and troubleshooting skills.
HVAC Technician - 2nd Shift - 2k Sign On Bonus CBRE Group IncHVAC Technician - 2nd Shift - 2k Sign On BonusCambridge, MAAs a key member of CBRE's Engineering & Technical Services team, you will be responsible for maintaining, troubleshooting, and repairing commercial HVAC and mechanical systems to ensure optimal performance across office, laboratory, and research spaces. CBRE Global Workplace Solutions (GWS) works with clients to make real estate a meaningful contributor to organizational productivity and performance.
Gas Technician - Residential HVAC Service Townsend EnergyGas Technician - Residential HVAC ServiceDanvers, MA$32–$45 / hourFull timeFounded in 1931, we are the local name you can depend on for energy and HVAC for residential and light commercial heating and cooling needs. Propane and electric heating/air conditioning systems, heat pumps, ductless systems, and boilers.
Commercial HVAC Service Technician CaptiveAireCommercial HVAC Service TechnicianBoston, MassachusettsNation’s leading manufacturer of commercial kitchen ventilation systems, and now offering a complete solution of fans, heaters, ductwork and HVAC equipment. Strong commitment to the development of our employees, including continuous education opportunities like product specific training, and company developed technical videos.
HVAC Technician (Residential/Commercial) GpacHVAC Technician (Residential/Commercial)Quincy, MA30–50GPAC (Growing People and Companies) is an award-winning search firm specializing in placing quality professionals within multiple industries across the United States since 1990. This position involves servicing, repairing, installing, and maintaining residential and commercial HVAC systems.
HVAC Technician - Boston, MA (MASS Refrigeration License) Mentor Technical GroupHVAC Technician - Boston, MA (MASS Refrigeration License)Boston, MAFull timeMentor Technical Group es un empleador que ofrece igualdad de oportunidades y todos los solicitantes calificados recibirán consideración para el empleo sin importar raza, color, religión, sexo, orientación sexual, identidad de género, información genética, origen nacional, estado de veterano protegido, estado de discapacidad o cualquier otro grupo protegido por ley. As a world leader in life science engineering and technical solutions, MTG has the knowledge and experience to ensure compliance with pharmaceutical, biotechnology, and medical device safety and efficacy guidelines.
Experienced HVAC Service Technician Obie Comfort SolutionsExperienced HVAC Service TechnicianFramingham, MA$30–$39 / hourFull timeIf you're an experienced Residential HVAC Service Technician looking for a long-term home with minimal on-call demands and a company that invests in its people, we'd like to talk with you. That's why we focus on providing a supportive work environment, reliable schedules, strong communication, and the resources technicians need to succeed.
HVAC Systems Technician Northeastern UniversityHVAC Systems TechnicianBurlington, MAThe HVAC Systems Technician will specialize in maintaining and repairing individual HVAC components such as damper actuators, valve actuators, thermostats, and Laboratory Fume Hood exhaust systems to ensure precise functionality and optimal performance of integrated systems. Must be physically able to meet all job requirements including lifting items over 50 lbs and the ability to bend, sit, squat, stand, crawl, walk, climb, push/pull, kneel, handle objects (manual dexterity), reach above shoulder level, and use fine finger movements.
HVAC Technician MAIN STREAM MECHANICAL INCHVAC TechnicianAmesbury, MA$38–$45 / hourDuties include the service, repair and installation of high efficiency heating systems, air conditioning systems, ductless and heat pump systems and water heaters. Effectively troubleshoot, diagnose and repair malfunctioning gas heating systems, AC systems, split systems, heat pumps.