❄️ Official Rankings
10 Best HVAC in San Marcos, TX (September 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 September 2026.
- HVAC ranked
- 10
- Average rating
- 4.9★
- Reviews analyzed
- 4,702
- Area code
- 512
⭐ 5.0 · 748 reviews
3500 TX-123, San Marcos, TX 78666
⭐ 4.9 · 2795 reviews
1902 Dutton Dr, San Marcos, TX 78666
⭐ 5.0 · 92 reviews
415 N Guadalupe St, San Marcos, TX 78666
⭐ 4.9 · 378 reviews
4105 Hunter Rd Bldg 8, Ste 11, San Marcos, TX 78666
⭐ 4.9 · 111 reviews
3519 TX-21, San Marcos, TX 78666
⭐ 5.0 · 43 reviews
326 N LBJ Dr Ste 212, San Marcos, TX 78666
⭐ 4.8 · 284 reviews
105 Picasso Dr, San Marcos, TX 78666
HVAC listed here serve San Marcos, Hays County, and nearby ZIP codes including 78666, 78667.