#1 Thorsen's-Norquist
Turlock · Licensed since 1994
Family-run Turlock plumbing, heating and air conditioning company that traces its roots to 1911 and serves Modesto and Turlock homes and businesses.
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#2 Dycus Heating & Air Conditioning
Modesto · Licensed since 2001
Family-owned heating and air conditioning company founded in Modesto in 2001 by David and Shaunna Dycus, serving homes and businesses.
#3 Mel's Heat & Air
Turlock · Licensed since 2008
Turlock heating and air conditioning company working in Modesto and across Stanislaus County since 1989, for homes and businesses.
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#4 TMC Heating & Cooling
Modesto · Licensed since 2016
Modesto heating and cooling contractor, licensed since 2016, serving homes and light commercial customers in Stanislaus and San Joaquin counties.
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Rankings follow our published criteria (see How we rank). License details come from the California Contractors State License Board (CSLB); services, hours and prices from each company's own website. Confirm prices and availability with the company.
About HVAC in Modesto
Modesto summers are hot and dry, with July afternoons averaging about 94°F at the city airport, while January nights average near 38°F, so homes rely on air conditioning in summer and furnaces or heat pumps in winter. HVAC contractors in California are licensed by the Contractors State License Board (CSLB) under the C-20 Warm-Air Heating, Ventilating and Air-Conditioning classification. Some local firms still replace evaporative (swamp) coolers alongside central systems. Ranked by license record and years licensed, never by payment. Checked 27 October 2026.