English: (512) 749-0220

Español: (512) 395-4817

Open 24 Hours

EMERGENCY SERVICE

Financing Available

WITH APPROVED CREDIT

Open 24 Hours

Emergency Service

Financing Available

With Approved Credit

San Marcos Air Conditioning

AC Inspection, Maintenance and Installation

Air Conditioning & Cooling

Save time and money with our certified Air Conditioning repair technicians.

Heating & Furnaces

Furnace solutions to keep your house warm. Install a furnace today.

Service & Maintenance

Maintenance is essential to the functioning of your Heating and Cooling system.

What Our Clients Say

Customer service was excellent! They attentively listened to my concerns and resolved the issue right away. I’m definitely going to use them again

Hernán H

This company exceeded my expectations. The personnel was respectful and answered all my questions. I am pleased with the work done. I place my trust in this company because of the guarantee given in writing. I highly recommend this company.

Inez R.

UST - Reliable Service in San Marcos

San Marcos Air Conditioning Company


San Marcos Air Duct, Insulation, Furnace, Air Conditioning repair and replacement company offers top repair services. UST can resolve any issues that may arise within your home. San Marcos‘s HVAC (heating, ventilating, and air conditioning) technicians are experts at inspecting and repairing systems that are not cooling or heating properly. They specialize at everything from condensers, coils, air ducts, air filtration to complete AC installations and AC replacements with the best warranties. Need an annual tune-up up? Ask about our service membership. Annual checkups can help prevent many issues from happening to your system. Our platinum premier membership gives customers one tune-up for their heating and another for their air conditioning. This makes sure that you have what your home needs when you need it. UST can help with the ongoing maintenance of all of your important air conditioning and furnace equipment, as well as annual home inspections to help prevent major HVAC emergencies down the road.

Professional AC Repair San Marcos

Honesty and integrity are the hallmarks of the US Thermodynamics business philosophy and are the foundation upon which the company was founded.

We thrive on providing clear explanations to our customers and doing things right the first time. We look forward to serving you and your family for life by providing peace of mind with the best warranties in the business.

You can count on our analysis of your home’s heating and cooling problems as well as our recommendations for installation, and maintenance. We provide state-of-the-art equipment, so all jobs are performed professionally and efficiently. To schedule an appointment with some of the best San Marcos furnace and air conditioning repair and installation experts, call (512) 395-4817.


US Thermodynamics is a leading and reputable Heating, ventilation, and Air Conditioning company based in San Marcos, Texas. Ever since we opened for business, we’ve taken a comprehensive approach to the region HVAC conditions, providing our clients with a wide range of services to cover their needs. Get in touch today to learn more about what we can offer you and to receive your free estimate.

AC Services Offered in San Marcos

Residential & Commercial Air Conditioning Repair San Marcos

  • Air Purifier System
  • HVAc Parts, Repair, Installation
  • Ductless Systems
  • Attic Insulation and Ventilation
  • HVAC Repair
  • HVAC Maintenance Tune Up and Inspection
  • HVAC Replacement Cost and Installation
  • Gas Furnace Installations

UST Is Here To Make You Smile With Quality HVAC Services

Please Call To Confirm Service in Your Area


© 2019 ​US Thermodynamics

Main Office:
San Marcos, TX, 78666

Connect With Us

Expert Air Conditioning & Heating Service