Verified Sunnyvale HVAC and air conditioning companies for AC repair, AC replacement, heating service, and duct work - serving Mountain View, Cupertino, Los Altos, Santa Clara, Palo Alto, Milpitas and beyond.
When the AC dies in July, speed matters - but so does not getting sold a system two sizes too big. A top-rated HVAC company quotes load calculations, not guesses, and stands behind the install with a real labor warranty.
In the heart of Silicon Valley, Sunnyvale's modest-looking ranch homes are worth millions - and their owners keep them dialed in. When you compare HVAC and air conditioning companies in Sunnyvale, ask every one of them the same three questions: are you licensed and insured for this exact work, who is actually showing up (your crew or a sub), and what does the warranty cover in writing.
Searching for HVAC and air conditioning companies near me in Sunnyvale? Everyone ranked below serves Sunnyvale and the surrounding neighborhoods, including Mountain View, Cupertino, Los Altos, Santa Clara, Palo Alto, Milpitas. Check the address and service area on a listing before you call, because the closest one is not always the one a search engine puts first.
If this is an emergency, call rather than fill in a form. An AC that dies in a heat wave, or heat that dies in a freeze, is the case for calling instead of waiting for morning. Ask up front whether they are dispatching tonight and what the after-hours call-out fee is: 24/7 availability is not something a star rating can tell you.
Based on Google ratings and review volume as of September 2026, the top rated HVAC and air conditioning companies in Sunnyvale are Nur HVAC, Modern Air, United HVAC, Plumbing & Electrical. See the live ranked list, ratings, and contact details on this page.
Every company ranked on this page serves Sunnyvale and the surrounding area, including Mountain View, Cupertino, Los Altos, Santa Clara, Palo Alto, Milpitas. Open any listing for its address, phone number and service area, then call the two or three closest to you. Distance is worth checking yourself: the nearest HVAC company is not automatically the best one, so this page ranks on rating and review volume first and leaves proximity to you.
After-hours availability is not part of a Google rating, so this directory cannot verify it for you in advance. An AC that dies in a heat wave, or heat that dies in a freeze, is the case for calling instead of waiting for morning. Call the top rated HVAC and air conditioning companies on this page and ask two things before you agree to anything: are you dispatching tonight, and what is the after-hours call-out fee. A company that answers both plainly on the phone is usually the one that actually shows up.
When the AC dies in July, speed matters - but so does not getting sold a system two sizes too big. A top-rated HVAC company quotes load calculations, not guesses, and stands behind the install with a real labor warranty.
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