Your Trusted HVAC Experts in St. Louis

Reliable heating and cooling services since 1972. From installations to repairs, we’re here to keep you comfortable year-round.

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Comprehensive HVAC Services You Can Count On

Whether it’s a quick repair or a complete system upgrade, our skilled technicians are here to deliver expert HVAC solutions tailored to your needs.

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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.

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Experienced Team

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

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Licensed & Insured

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

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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
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
A man in a hard hat is holding a cylinder of gas

 â˜… ★ ★ ★ ★

They were great! Father and son came to work on my electric furnace and they got it fixed! I will have them work on my ac this summer

Kevin S.

What Our Customers Are Saying

401 Pine St, St. Louis, MO 63102, US

Proudly Serving St. Louis and Beyond

Providing expert HVAC services to St. Louis, MO, and surrounding areas. Wherever you are, we’re ready to help.

  • Maryland Heights, MO
  • Florissant, MO
  • Belleville, IL
  • Edwardsville, IL
  • Collinsville, IL
  • Chesterfield, MO
  • Crestwood, MO
  • Kirkwood, MO
  • Webster Groves, MO
  • Clayton, MO
  • St. Louis, MO