Air Conditioning

Jon-Wayne Company has kept Mount Vernon and Northeast Texas comfortable since April 1, 1983, when founders Jon Clinton and Wayne Morris opened their doors at 203 Interstate 30 West. Forty-three years and two building expansions later, we are still a single-location, locally owned HVAC contractor—not a franchise, and not to be confused with similarly named HVAC companies. When you call our experts at (903) 537-4531, you are reaching the same Mount Vernon crew that's served this county for four decades.

We are a Carrier-authorized dealer, TDLR-licensed (TACLA024747C), and A+ rated with the Better Business Bureau (BBB). Beyond installing and repairing HVAC equipment, we believe an informed customer makes a better decision about their home, which is why every recommendation we make comes with a thorough explanation of what your system needs and why.

Why Choose Jon-Wayne Company for Air Conditioning Services

• 43 years in one community: We didn't start as a large regional chain—we grew from a single Mount Vernon storefront in 1983 into the trusted local name for HVAC service across Mount Vernon, Mount Pleasant, Pittsburg, Sulphur Springs, Winnsboro, Yantis, and the surrounding lake communities.
• Manufacturer-recognized expertise: Jon-Wayne Company is a Carrier Authorized Dealer, and Carrier has independently designated our team as Carrier Indoor Air Quality Experts, a credential earned through dedicated coursework and testing. We also install Carrier heat pump systems, in addition to our full residential and commercial lineup of AC, heating, ductless, and IAQ equipment.
• Verifiable credentials, not just claims: Our HVAC technicians hold NATE certification, and our TDLR license (#24747) is a matter of public record. Our A+ BBB rating reflects a clean track record. You can verify all of it independently, not just take our word for it.
• Recognized locally: We are a member of the Franklin County Chamber of Commerce, and our team shows up again and again in customer reviews spanning multiple years because we send real technicians who build real relationships with the households they serve.
• One address, one team, since 1983: We are proud of our name, but it has occasionally caused confusion. Jon-Wayne Company is a distinct, independently owned business based solely in Mount Vernon, Texas, unaffiliated with any similarly named HVAC company elsewhere in Texas or in Missouri. If you're looking for the crew that's serviced Northeast Texas for multiple decades, this is it!

How Much Money Can a New Air Conditioner Save You?

Our SEER2 (Seasonal Energy Efficiency Ratio 2) energy savings calculator can help determine how much you could save on your utility bills. Simply enter your current unit’s SEER value and compare it to a newer, more efficient SEER2 unit. You can even customize it to better match your home’s system for a more accurate calculation.

Air Conditioning Basics

The four main components to your air conditioner are:

Condenser: The condenser is the outside metal unit and where the gas from the compressor is condensed into a liquid. The gas entering the condenser is very hot. The temperature is then lowered, so the gas can convert back to a liquid.

Compressor: The compressor is inside the condenser. It circulates the pressurized refrigerant, to concentrate the heat, and changes the low pressure gas to high pressure.

Evaporator: The evaporator is the part of the system inside the home. In simple language, it absorbs the heat from your home.

Expansion Valve: The expansion valve controls the amount of refrigerant in your system.

All of these pieces are connected by a copper tube that handles refrigerant, creating a closed loop. Heat is collected in the evaporator, sent outside to the condenser. The heat is removed, and the cool air is recirculated back into your home.

AC Facts

An Air Conditioner Doesn’t Create Cool Air.
What happens in the AC process is actually the removal of heat from the air. Your AC uses a chemical called refrigerant to remove heat and transfer it outside. The warm air runs through the lines and coils in your unit and goes from liquid to gas and back again. During this process, the refrigerant removes the heat and transfers it elsewhere so that when the air comes out the other side, it is cool.

Your AC Will Remove Humidity.
Lower humidity helps the overall comfort level in your home by making you feel cooler, even if the temperature is the same.

Your Air Filter Needs to Be Checked and Replaced Every Three to Six Months.
(depending on the manufacturer’s recommendations)
A dirty air filter restricts your air flow, which reduces efficiency, costing you money, and over time can put stress on your unit and could cause a costly repair.

Maintenance, Maintenance, Maintenance.
Your air conditioner needs regular checkups to keep it running in tip-top shape. Having regular annual preventative maintenance will bring your system longer life and fewer breakdowns over all.

SEER
The Seasonal Energy Efficiency Ratio (SEER) measures air conditioning and heat pump cooling efficiency, which is calculated by the cooling output for a typical cooling season divided by the total electric energy input during the same time frame. A higher SEER rating means greater energy efficiency.

Contact Our Air Conditioning Installation, Repair, and Maintenance Experts for Service in Northeast Texas

Whether you need a same-day repair, a seasonal tune-up, or a full system replacement, Jon-Wayne Company brings 43 years of hands-on, Mount Vernon–based experience to every job—backed by Carrier's own certification, an A+ BBB rating, and a licensed, locally accountable team. Call (903) 537-4531 to schedule service, or ask us about the Carrier Indoor Air Quality Expert and HVAC product options most homeowners in Northeast Texas don't even know are available to them.