Air Conditioning

Air conditioning service.

Lonestar Comfort Services is your #1 HVAC contractor in Castroville, TX, 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 Lonestar Comfort Services 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 Lonestar Comfort Services, we provide all the services you need to keep your AC running in top-notch shape. Call us at 830-538-9450 for repairs, maintenance, or new-system installation.

Air Conditioner Maintenance in Castroville, TX, 78009

“I am a LoneStar comfort club GOLD member.
The plan includes "Repair Warranty" 2 years.
Outdoor unit capacitor was replaced, though still working, due to "out of compliance capacitance".
This capacitor clearly stated, "5 year unconditional warranty" AND was installed by Lone Star less than 2 years ago.
I was invoiced for a $133 WARRANTY PROCESSING FEE. There is no "*" noted on the protection plan indicating a "FEE" for "WARRANTY" work.
To make matters worse the capacitor was replaced with the "same" manufacturer's capacitor. Might be looking at another failure in less than two years!!!!!

I suspect I'd have been better off not paying the protection plan, capacitor failing and having another service provider fix it.

The only reason for a 2 star vs. 1 star rating is that the tech, Keldon, did excellent service work and confirmed LS comfort services management recommended replacing the still functioning capacitor.”
- Paul L.

Air Conditioner Installation in Devine, TX, 78016-0056

“Absolutely best company to service or replace your home air conditioning system! They are knowledgeable and send capable technicians who show by their expertise, they know the business!”

- Nikki H.

Air Conditioner Maintenance in Castroville, TX, 78253

“Billy was very courteous and did a great job explaining everything he did.”

- Tobe W.

Air Conditioner Repair in San Antonio, TX, 78253

“Brandon quickly diagnosed the problem with the system. He provided us with several options for the repairs based on our budget and explained everything thoroughly. While the parts weren't ready immediately, he did get them and returned to make the necessary repairs later in the evening to get us AC. Exceptional customer service and work. Will be a repeat customer.”

- Edmund S.

Air Conditioner Maintenance in Castroville, TX, 78009

“Great service and quality work!”

- Matt L.

Air Conditioner Repair in San Antonio, TX, 78240

“William was very knowledgeable and explained everything in detail. We have a very old a/c unit that has lasted many years. He proposed several options. We have loved the service.”

- Sherry H.

Air Conditioner Maintenance in Castroville, TX, 78009

“Billy was very prompt, very knowledgeable, explaining everything he was doing and making suggestions on repairs that would make our unit more efficient. We felt very comfortable and would recommend Lone Star to anyone that's need any type of A C services..”

- Gloria F.

Air Conditioner Repair in LaCoste, TX, 78039

“William Meyer was a top notch technician.He is very friendly and professional.Lone Star is one the best companies to do business with.They are very best in my book,I highly recommend them”

- Robert B.

Air Conditioner Repair in Castroville, TX, 78009

“I wanted to thank Rita and William for provided us with great service with my a/c issues. Rita set up a quick appointment, regardless of severity, and William was outstanding when troubleshooting and fixing my issues. Can’t be happier with this company’s services. Thank you.”

- Juan F.

Air Conditioner Maintenance in LaCoste, TX, 78039

“William was fantastic. Explained everything so well when he was done. Great job!!”

- Linda M.

Need Air Conditioner Service?

Contact the experts at Lonestar Comfort Services.

Call us at 830-538-9450!