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Best heating and air conditioning pros near San Marcos, CA

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TRUSTED BY SAN MARCOS, CA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon575
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in San Marcos - Updated Nov 2026

Avatar for Airmerica Air Conditioning & Heating
Airmerica Air Conditioning & Heating
5.0(
34
)
Central A/C - InstallElectric Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - Install+31 more

Serving San Marcos, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"We hired Airmercia Air Conditioning & Heating to evaluate our heating system and propose repair solution. Ryan was very professional and punctual. He did not make any force sales. He just offered various repair and replacement solutions and explained pros and cons for each one. We decided to replace our furnace and duct system. Ryan did an excellent Job!! I highly recommend him for your HVAC project."
Ultra Lo NOx 80% furnace and coil with Air-Wave air cleaner and 2" media filter
Outdoor unit feeding (5) indoor wall mounts
Heating & A/C Project
Single stage 14.3seer2 AC condenser
Outdoor unit feeding (5) indoor wall mounts with electrical ran by us from panel.

+6

Response time8 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for Air Duct Professionals
Air Duct Professionals
4.7(
1,518
)
Air Ducts & Vents - Clean

Serving San Marcos, CA and surrounding areas

Approved

In business since 1990

Free estimates

Warranties offered

"Crew showed up on time. Job was completed in an hour. Afterwards my entire home was covered in a layer of sheetrock dust. One crew member wiped the dining table and kitchen countertop. I was shocked at the amount of dust. I spent the next 2 days vacuuming everything including the walls! The bedspreads and comforters will require a trip to the dry cleaner. Additional cost! And NO the price did not include a new air filter!"
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+11

Response time1 day
2 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Sky Clean Air
Sky Clean Air
4.7(
21
)
Central A/C - InstallAir Ducts & Vents - CleanBoiler or Radiator Heating System - Install or Replace+48 more

Serving San Marcos, CA and surrounding areas

Approved

In business since 2017

Free estimates

Credit card accepted

"I was really impressed with the service provided by Nadav and he is team. I have a thirty year old home that still had the original HVAC systems. One located in the attic and the other underneath the house. Neither of these installations was simple. The Sky Clean Air team quoted me two days to remove and install new systems. The install crew was really professional, courteous and hard working. The underneath the house install was especially difficult with a tight crawl space in a less than hospital environment. These guys were not a show up at 10 leave at 3 pm crew.......they worked long hours both days to ensure they met the promised schedule.They kept me informed any issues throughout the installation process so there were no surprises. At the end of two days we had two beautifully installed systems that now cool our 4000 sq ft house in a matter of an hour instead of the 4 or 5 the old system required. I feel that the pricing they gave me was very fair and at the end of the job I felt like I got more value than what I paid. I would certainly use them again in the future."
Air duct full of dust and debris.
Cleaned duct
Additional Photos
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+24

Response time11 hrs
Response rate100%
4 neighbors recently requested a quote
Avatar for Heating and Air 365
Heating and Air 365
5.0(
21
)
Central A/C - InstallCentral A/C - Service or RepairGas Furnace / Forced Air Heating System - Install+4 more

Serving San Marcos, CA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"My ac, heater, and thermostat all went out at the same time. I called an hvac company and they said I needed a new furnace and ac and it'd be $12k. I called Heating and Air 365 to try to get a cheaper quote on a new system. Tommy came out and said the system was fine. It just had a short in the thermostat wires by the ac, my dog must have chewed through them. He replaced the wires and fixed something in the furnace and everything is working great. He saved me thousands. It's refreshing to see some honesty out there. He's got my business for life."
New HVAC system!
New HVAC system!
Old vs New coil
Big Bear Mini Split
Mercury Thermostat

+9

Response time1 day
Response rate86%
5 neighbors recently requested a quote
Avatar for JMS West HVAC
JMS West HVAC
4.6(
193
)
Central A/C - Service or RepairHeat Pump - Repair or ServiceGas Furnace / Forced Air Heating System - Repair

Serving San Marcos, CA and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"At the beginning of the heatwave last week, I received a call from the family renting my condo in East County and they informed me that the AC stopped working. I tried a half dozen HVAC companies and none of them were available to provide service until the end of the week. I received a call from JMS West HVAC and they were available to provide service on that same day! Within two hours, the AC unit was repaired and my rental family was safe for the long hot week. The JMS repair crew was extremely professional and took care of business. Thank you!"
Naranja
Naranja
Naranja
Naranja
Naranja

+2

Response time12 hrs
7 neighbors recently requested a quote
Recommended by93%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

There are two main reasons your furnace and AC are turning on at the same time. The first could be that you’re confusing the furnace with the blower. The blower is located in the furnace and will turn on to distribute cool air from the air conditioner through the ductwork in the home. This is normal. If the actual furnace is turning on at the same time as the AC and hot and cool air are coming into the home, it could be a result of incorrect writing to a new thermostat or new systems.

Freon will go in the refrigerant lines near the back of your AC unit. Look for small ports with caps on a thin copper line—the Freon goes into those ports. You are best off hiring a licensed HVAC professional who can complete the job safely and correctly.

The best way to compare HVAC quotes is getting a few detailed quotes from local companies with good reputations. Then, go over the quotes line by line. Protect yourself by insisting on in-person estimates that include equipment manufacturer names, model numbers, SEER ratings, amounts and numbers of materials, details of warranties on equipment and labor, and other specifics. 

Knowing the exact equipment and materials is the only way that you can fairly compare quotes. Quotes that are much lower than others can be a sign that the company isn’t providing the best quality service or materials.

Air filters with a high MERV rating, 11 or above, shouldn't cause airflow problems in most residential systems. However, the airflow can be restricted in some HVAC systems if they aren't designed for high MERV ratings. If in doubt, a local duct installer should inspect your ductwork so that you know what your system can handle.

There are several steps you can take to prevent your AC drain from clogging. This includes cleaning the drain line at least every three months, changing the filter every one to three months, and getting your AC serviced annually. Also, if any problems arise with your AC, hire an HVAC technician to deal with them ASAP.

The San Marcos, CA homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.