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.

Person repairing an air conditioner, using tools near copper pipes and a metal coil.
Man working on an air conditioning unit outside. He is connecting wires.

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.

Person in cap opening air conditioning unit on white wall.
Person in gloves testing electrical panel wiring 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.

Person installing electrical outlet with a drill in a white wall.
A person in a blue jumpsuit installs a white air conditioner on a wall.

Electrical Repair

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