#1 Casa Mechanical Services
Round Rock · Licensed since 1989
Family-owned Round Rock heating, cooling and plumbing company, run by the Christianson family since April 2001, serving homes and light-commercial customers.
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Best commercial HVAC companies in Round Rock, TX
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#2 Chilly Air Services
Round Rock · Licensed since 2003
Round Rock company that has repaired and installed heating and cooling systems for homes and businesses in Williamson County since 2016.
24/7
#3 Cool Kids AC & Heat
Georgetown · Licensed since 2009
Family-owned HVAC and plumbing company with locations in Georgetown and Round Rock that repairs and installs cooling and heating systems for homes and businesses.
#4 Capitol Air Conditioning Services
Georgetown · Licensed since 2010
Family-owned Georgetown HVAC contractor founded in 2003 that repairs, installs and maintains heating and cooling systems for homes and light-commercial buildings.
24/7
#5 Altruistic AC, Heating & Plumbing
Pflugerville · Licensed since 2015
Locally owned Pflugerville company led by Lesllisnel Sariol that repairs and installs air conditioning, furnaces, ductwork and mini-splits for homes and businesses.
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Rankings follow our published criteria (see How we rank). License details come from the Texas Department of Licensing and Regulation (TDLR); services, hours and prices from each company's own website. Confirm prices and availability with the company.
About HVAC in Round Rock
Round Rock averages daytime highs of about 95 to 96°F in July and August, so air conditioning carries most of the load, while January lows near 35°F still call for working heat. Texas HVAC contractors are licensed by the Texas Department of Licensing and Regulation (TDLR) as Class A or Class B air conditioning and refrigeration contractors, with license numbers that begin TACLA or TACLB. Ranked by license record and years licensed, never by payment. Checked 27 October 2026.