Comprehensive HVAC Services for Every Need

As a proudly Black-owned and veteran-owned business, Diagnostic Heating & Cooling provides expert installation and repair services to keep you comfortable all year round. Count on our team for reliable HVAC solutions you can trust.

Your Go-To HVAC Specialists in St. Louis

With over 70 years of combined experience, we’ve mastered the art of keeping homes and businesses comfortable. Our team delivers exceptional results with integrity and skill.

our services

HVAC Repair

Our fast and efficient HVAC repair services ensure your heating and cooling systems get back to optimal performance. Whether it's a noisy air conditioner or a heating issue in winter, we’ve got you covered with trusted expertise.

Technician repairing an air conditioner condenser with tools and refrigerant lines visible
Technician repairing the back of a white air conditioner unit with tools on a patterned floor

HVAC Installation

Upgrade your home or business with energy-efficient HVAC systems from top brands like Bryant, Goodman, Amana, and American Standard. We make installation seamless, ensuring long-lasting comfort and reliability.

HVAC Maintenance

Prevent breakdowns and improve energy efficiency with our regular maintenance services. From filter replacements to system tune-ups, we ensure your equipment works like new.

Technician cleaning a wall-mounted air conditioner with a cloth
Technician testing electrical wiring in a control panel with a multimeter

Electrical Maintenance

Don’t let electrical issues disrupt your day. Our skilled technicians provide thorough maintenance services, ensuring your electrical systems operate safely and efficiently.

Electrical Installation

From wiring upgrades to new installations, our electrical services provide safe and dependable solutions for all your power needs.

Hands installing an electrical outlet with a drill during home repair
Man installing a smoke detector on a white wall, smiling and wearing a cap and dark shirt

Electrical Repair

We troubleshoot and fix electrical issues efficiently, ensuring your home or business stays powered without interruptions.