Committed to Comfort and Excellence Since 1972

For over 50 years, Diagnostic Heating & Cooling has delivered trusted HVAC services with integrity and professionalism.

Our Legacy of Excellence in Heating and Cooling

At Diagnostic Heating & Cooling, we’ve built our reputation on trust, expertise, and unwavering dedication to customer satisfaction. Our team combines decades of experience with cutting-edge technology to deliver solutions that exceed expectations. We’re proud to be a trusted name in HVAC services for homes and businesses in St. Louis and surrounding areas.

A white background with a few lines on it

Why St. Louis Chooses Diagnostic Heating & Cooling

With over 70 years of combined experience, we’re committed to providing top-notch service and solutions that exceed expectations.

A group of people standing next to each other with arrows pointing in opposite directions.

Experienced Team

For over 70 years, we’ve been in the HVAC Industry.

A black and white icon of a certificate with a ribbon and a check mark.

Licensed & Insured

We meet the highest local and regional standards, and use only certified products.

A hand is holding a wrench and giving a thumbs up.

HVAC Specialists

Together with you, we create the landscape plan that considers all of your needs.

A black and white drawing of a price tag with a dollar sign on it.

Competitive Prices

You’ll receive the highest quality products and services, at the very best prices.

A white background with a few lines on it