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 Devine, TX, TX 78016

“He was very nice, went about his work efficiently.”
- Elwanda G.

Air Conditioner Replacement in San Antonio, TX 78245

“Great Company and the technicians were fantastic, clean and very polite, Since my new AC my Electric Bill dropped by Half! My AC went out middle of July they were there the very next day and set me up with a mini AC unit which was perfect after ordering all the parts they were there 2 days later. Ryan and Billy were totally amazing I highly recommend Lonestar for any of their services”

- Debbie H.

Air Conditioner Maintenance in San Antonio, TX, TX 78245

“We are very happy with the service we received.”

- Leah E.

Air Conditioner Repair in Hondo, TX 78861

“Amazing service. Friendly, professional serviceman. Kept me informed on repair timelines and repair completed on time. So thankful I have the platinum service plan, a real money saver!”

- Christie M.

Air Conditioner Maintenance in Castroville, TX 78009

“William came by our house on Wednesday and performed our Comfort Club fall tune-up and he did a wonderful job. Very polite and knowledgeable. Our blower was quite dirty and making a terrible noise, William cleaned it up and now we can't hear it running. Excellent job!”

- Robert M.

Air Conditioner Repair in San Antonio, TX, 78245

“Great service done by Technician Billy, professional job well done..”

- Benny M.

Air Conditioner Repair in San Antonio, TX, 78254

“Billy was fantastic! He was friendly, thorough and fixed our unit up quickly and efficiently. We really appreciated his help coming out on the weekend holiday. Thanks again!”

- Sarah M.

Air Conditioner Repair in Castroville, TX, 78009

“Thank you so much for coming so quickly, William did an excellent job and I am cooling once again. Thank you very much and God Bless You!”

- Maria J.

Air Conditioner Installation in Mico, TX, 78056

“Brandon Jonas and his crew were very professional and punctual with their service call.
He explained everything very well also Richard Guzman technician very good.
We would recommend Lone Star Comfort A/C Service to everyone.
Thank you again for great service.
Gloria and Fred Meisner”

- Brandon J.

Air Conditioner Maintenance in Natalia, TX, 78059

“Technician is very knowledgeable and explained what my AC needed. He arrived on time overall I was satisfied with the service.”

- Julio G.

Need Air Conditioner Service?

Contact the experts at Lonestar Comfort Services.

Call us at 830-538-9450!