❄️ Official Rankings

10 Best HVAC in San Marcos, TX (August 2026)

We compared 10 hvac serving San Marcos and Hays County, Texas, and ranked the top providers by verified reviews, ratings, and local reputation — 4,702 customer reviews in all.

The 10 listed below hold an average rating of 4.9 out of 5, led by SM Air A/C & Heating. Updated for August 2026.

HVAC ranked: 10
Average rating: 4.9★
Reviews analyzed: 4,702
Area code: 512

SM Air A/C & Heating

⭐ 5.0 · 748 reviews

3500 TX-123, San Marcos, TX 78666

Visit Website →+1512-546-7589

Kinship Air Conditioning

⭐ 5.0 · 120 reviews

Visit Website →+1512-709-4952

Woods Comfort Systems

⭐ 4.9 · 2795 reviews

1902 Dutton Dr, San Marcos, TX 78666

Visit Website →+1512-881-0056

Authentic Air

⭐ 5.0 · 103 reviews

215 Calixto Ct, San Marcos, TX 78666

Visit Website →+1512-757-4206

American Air Heating and Air Conditioning

⭐ 5.0 · 92 reviews

415 N Guadalupe St, San Marcos, TX 78666

Visit Website →+1512-357-1499

AirOne Heating and Air Conditioning

⭐ 4.9 · 378 reviews

4105 Hunter Rd Bldg 8, Ste 11, San Marcos, TX 78666

Visit Website →+1512-392-0022

So Cool Service, LLC

⭐ 4.9 · 111 reviews

3519 TX-21, San Marcos, TX 78666

Visit Website →+1512-665-0940

Shafer Services Plus

⭐ 5.0 · 43 reviews

326 N LBJ Dr Ste 212, San Marcos, TX 78666

Visit Website →+1512-398-9656

Quality HVAC & Refrigeration

⭐ 4.8 · 284 reviews

105 Picasso Dr, San Marcos, TX 78666

Visit Website →+1512-738-0081

#10

San Marcos HVAC Experts

⭐ 4.9 · 28 reviews

621 Clyde Ct, San Marcos, TX 78666

+1512-201-1041

HVAC listed here serve San Marcos, Hays County, and nearby ZIP codes including 78666, 78667.