Air Conditioning

Air conditioning service.

Dunco Heating & Cooling is your #1 HVAC contractor in Lawrence, KS, and the surrounding communities. We are the leading company for all of your air conditioning needs. If you need repairs, maintenance, or a brand new system installed, the technicians at Dunco Heating & Cooling are the qualified and professional crew for the job.

We provide the highest quality service for your air conditioner. We also aim to educate and inform our customers. Informed decisions are good decisions. We want you to feel confident we are qualified to perform the service for which you are hiring us.

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.

SEER2 Energy Savings Calculator

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This calculator does not guarantee actual costs or savings and is only to be used for educational purposes.

Customize to Your Home

Adjust these settings for a more accurate calculation:




Rate (¢/kWH)


Average Annual Cooling Hours***

Historical Comparison

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** Data from U.S. Energy Information Administration
*** Data from 2002 EPA study

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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.

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.

At Dunco Heating & Cooling, we provide all the services you need to keep your AC running in top-notch shape. Call us at 785-843-7137 for repairs, maintenance, or new-system installation.

Air Conditioner Repair in Topeka, KS 66618

“My husband and I returned home at 10:30pm, on a Saturday night, to our AC being out. It was 111 degrees that day and the entire next week was going to be triple digits. Our house was already 81 degrees and it was still 95 outside. We called Dunco and got an answer right away, a tech called back within 10 minutes and said he could be at our house at 7am the next morning (a Sunday.). He called when he was ten minutes away, arrived twenty minutes before promised and had us running within 30 minutes that morning. He was so kind and fairly priced. Our expectations were exceeded in every way! We had a friend who’s AC also went out and had been out for 13 hours without even a response from anyone who immediately called Dunco herself after hearing our great experience. We’ll definitely use them again.”
- Dustin W.

Air Conditioner Maintenance in Lawrence, KS 66049

“Very friendly, polite! Let me know my a/c needed to be replaced that he would call my landlord and they would get it all figured out! Next day new a/c unit and very pleased with how fast the issue was fix!”

- Stephanie T.

Air Conditioner Replacement in Lawrence, KS 66049

“Where do I start. Pre-covid I used another very popular company in town and had their maintenance program etc. they told me then that my unit was bad and needed to be replaced etc.. at that time it was 16 years old but I did not have any issues. I got a 2nd opinion from Dunco and said my unit was perfectly fine and running as it should. I switched my maintenance program to Dunco and ever since has been running fine and continued to tell me that the unit is getting older and the day will come to replace but for now it is good to go etc… 2 weeks ago my unit went bad on a hot day and on a Friday. They came out and fixed it on friday night so we could have cool air but ended up replacing AC, Furnace and did a free duct cleaning! Jason was the tech that talked about pricing and fixed the unit 2 weeks ago. The team that came in to replace everything was FANTASTIC! Super nice and started at 8 and finished 530. Long day but they got it done. Bought pizza for the crew and we sat around the kitchen table for lunch and chatted. They loved on my dogs and just had a great day and experience. I highly, highly recommend you only work with Dunco as they have been 100% honest with me since the beginning, offered great 0% financing for 5 years and the service was awesome. Sorry for the long review but I wanted you to know my entire experience.”

- Kitcha P.

Air Conditioner Maintenance in Overbrook, ST 66524

“Ryan was great! Always pleased with service from Dunco! Thank you!”

- Marty Y.

Need Air Conditioner Service?

Contact the experts at Dunco Heating & Cooling.

Call us at 785-843-7137!