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This is an excellent opportunity for a student pursuing a degree in Accounting, Finance, or Business Administration who wants meaningful real-world accounting experience beyond basic administrative tasks. This internship offers hands-on experience in accounting operations, payroll support, accounts payable/receivable, job costing, and construction accounting within a fast-paced HVAC environment.

HOUR

Summer Accounting InternDuration: May 2026 - August 2026Schedule: Part-Time or Full-Time Summer InternshipCrystal Heating & Cooling Service, Inc. is seeking a motivated and detail-oriented Summer Accounting Intern to support our Accounting Department during our busy summer season. This internship offers hands-on experience in accounting operations, payroll support, accounts payable/receivable, job costing, and construction accounting within a fast-paced HVAC environment.This is an excellent opportunity for a student pursuing a degree in Accounting, Finance, or Business Administration who wants meaningful real-world accounting experience beyond basic administrative tasks.Key Responsibilities<ul><li>Assist with Accounts Payable processing, invoice entry, and vendor file maintenance.</li><li>Support Accounts Receivable activities, including customer payment application and collections follow-up</li><li>Help reconcile credit card statements, bank transactions, and general ledger accounts</li><li>Assist with payroll preparation, reporting, and audit support</li><li>Support construction and union-related accounting functions, including equality funds processing, union reporting, prevailing wage documentation, and compliance tracking</li><li>Suppothe rt month-end close processes and preparation of journal entries</li><li>Organize and maintain accounting and employee documentation</li><li>Assist with job costing and financial data entry in ServiceTitan and QuickBooks</li><li>Prepare spreadsheets, reports, and financial analysis using Microsoft Excel</li><li>Support internal process improvement and special accounting projects</li><li>Assist with filing, scanning, and maintaining accurate accounting records</li><li>Maintain confidentiality of sensitive financial and employee information</li></ul>Qualifications<ul><li>Currently pursuing an Associate's or Bachelor's degree in Accounting, Finance, or Business Administration.</li><li>Basic understanding of accounting principles and financial statements</li><li>Strong attention to detail and organizational skills</li><li>Proficient in Microsoft Excel and Microsoft Office Suite</li><li>Ability to prioritize tasks and work independently in a deadline-driven environment</li><li>Strong communication and professionalism</li><li>Willingness to learn and take initiative</li></ul>Preferred Qualifications<ul><li>Prior office, bookkeeping, or internship experience preferred but not required.d</li><li>Experience with QuickBooks, ServiceTitan, or ERP/accounting systems is a plus.</li><li>Interest in construction, HVAC, or operational accounting environments</li></ul>What You'll Gain<ul><li>Hands-on accounting and finance experience in a growing company</li><li>Exposure to real-world month-end close and financial reporting processes</li><li>Experience with job costing and operational accounting</li><li>Exposure to union, prevailing wage, and construction compliance accounting processes is rarely offered in traditional internships</li><li>Mentorship from experienced accounting leadership</li><li>Opportunity to build professional skills in communication, organization, and problem-solving</li></ul>Compensation<ul><li>Paid internship ($18-$22/hour based on experience)</li><li>Flexible scheduling available</li></ul>About Crystal Heating & Cooling Service, Inc.Crystal Heating & Cooling Service, Inc. is a 100% employee-owned (ESOP) HVAC company serving residential and commercial customers throughout Missouri. We are committed to teamwork, integrity, growth, and delivering exceptional service to our customers and employees alike.

Crystal Heating and Cooling

Summer Accounting Intern

Accounting

Accounting Close

Accounting Policies

Accounting Software

Accounts Payable

Accounts Receivable

Administrative Skills

Billing

Bookkeeping

Business Administration

Communication Skills

Construction

Construction Support

Credit Cards

Credit and Collections

Customer Support/Service

Data Entry

Detail Oriented

Documentation

ERP (Enterprise Resource Planning)

Establish Priorities

File Maintenance

Finance

Financial Analysis

Financial Reporting

Financial Statements

Financial Transactions

General Ledger Accounting

HVAC

Intuit Quickbooks

Journal Entries

Leadership

Maintain Compliance

Maintenance - HVAC

Mentoring

Microsoft Excel

Microsoft Office

Operational Support

Organizational Skills

Payroll Accounting

Problem Solving Skills

Process Improvement

Reconciliation

Record Keeping

Reporting Skills

Service Delivery

Spreadsheets

Team Player

Time Management

Talent Acquisition

You will work alongside skilled professionals in various aspects of the wastewater treatment cycle, including system monitoring, data collection, and analysis, troubleshooting equipment, and ensuring compliance with environmental regulations. As a Treatment Plant Intern, you will gain hands-on experience in water treatment processes, operations, and maintenance at one of our facilities.

OverviewAs a Treatment Plant Intern, you will gain hands-on experience in water treatment processes, operations, and maintenance at one of our facilities. You will work alongside skilled professionals in various aspects of the wastewater treatment cycle, including system monitoring, data collection, and analysis, troubleshooting equipment, and ensuring compliance with environmental regulations. THIS IS A 5 WEEK SUMMER INTERNSHIP FOR STUDENTS STUDYING WASTEWATER OPERATIONS in the ERTC Program at SIUE.  Internships will run from May 12th - June 13th and June 16th - July 18th. Internships will be at one of the following Wastewater Treatment Plants.  Placement will be determined based on MSD needs.<ol><li>Bissell - 10 E. Grand Ave St. Louis, MO</li><li>Lemay - 201 Hoffmeister Ave St. Louis, MO</li><li>Missouri River - 3455 Creve Coeur Mill Road Maryland Heights, MO</li><li>Coldwater - 13798 Old Halls Ferry Rd Florissant, MO</li></ol>ResponsibilitiesQualifications<ul><li>Candidates must be currently enrolled in the ERTC Program at SIUE. </li><li>Pursuant to MSD's "Substance Abuse Policy and Procedures", this position has been designated as safety sensitive and candidate must pass a Non-D.O.T. Drug Test for this position. Employees occupying this position are not subject to Federal (D.O.T.) Drug and Alcohol Testing Regulations. </li><li>Must possess a valid driver's license issued by the state in which the employee resides. </li></ul>

Metropolitan St. Louis Sewer District

Treatment Plant Intern

Data Analysis

Data Collection

Driver's License

Environmental Compliance

Identify Issues

Operations Processes

Regulatory Compliance

Water Treatment

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Summer Accounting Intern Crystal Heating and Cooling

Treatment Plant Intern Metropolitan St. Louis Sewer District

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