Raleigh’s expert AC, heating, and air quality company.

24/7 Emergency Service



The Delta T Mission

To provide reliable, affordable HVAC repair and installation, air quality and ventilation solutions, and maintenance to families in the Raleigh area with honesty and integrity.

Our Approach

We don’t want your business once. We want it for life.

That’s why we work so hard to earn your trust by focusing on repairs, not system replacement. You shouldn’t have to deal with the stress and high cost of replacing a heating and cooling system when repairs can save you thousands and extend the life of the system. Replacement is a last resort after all repair options have been considered.


Treat people the right way. Do the work the right way. Help families feel more comfortable in their homes. This is the only way we know how to do business.

Meet Keith Evans

Owner and Founder, Delta T NC HVAC Services

Keith started working for his father’s HVAC company when he was 12 years old. To say Keith grew up in the industry is not an exaggeration. He studied applied engineering, experimental mathematics, and thermodynamics in college. Keith founded Delta T NC HVAC Services in 2015, applying his knowledge of the science behind HVAC to diagnose problems, calculate cost-benefit analyses, and develop the most effective solutions.

What Is Delta T?

In thermodynamics, the triangle is the symbol for the Greek word “Delta,” which means “change of.” In virtually all math equations, the capital T refers to “temperature.” When you put the two together, you have the perfect name for an HVAC company in Raleigh!

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