About Grumpy's HVAC

Grumpy's HVAC is a reliable HVAC contractor located in Sunnyvale, CA, with over thirty years of experience in the heating and cooling industry. Customers appreciate the honest and thorough service provided by the team, particularly highlighting the expertise of David. Many reviews mention his excellent communication skills and fair pricing. Clients have turned to Grumpy's for second opinions, often finding that other companies misdiagnosed issues, while David accurately identified problems and offered effective solutions. Grumpy's HVAC is praised for its quality workmanship, attention to detail, and the ability to complete installations smoothly and efficiently. Whether it's installing central heating and air in older homes or providing prompt service for repairs, Grumpy's has earned a strong reputation for dependability and skill. Many customers recommend the business to friends and co-workers, emphasizing the trustworthy and knowledgeable service they received. With a commitment to quality and customer satisfaction, Grumpy's HVAC stands out as a top choice for heating and cooling needs.

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Reviews for Grumpy's HVAC

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Apr 2026
Excellent and quality-oriented work on a tricky job. Removed old hydronic (water based) heating system and replaced with a modern heat pump. David got a licensed plumber to come and make sure that the old system was correctly removed from the plumbing network. New system is dead quiet and gets the job done efficiently.
Sep 2025
Second time I've reached out to Grumpy's and based on those two experiences I have no reason to ever call anyone else. David unfortunately was booked for weeks but took the time to walk me through troubleshooting on the phone, identified the problem and solution - all without ever actually seeing the problem in person. He went above and beyond to help despite his packed schedule and I was able to quickly fix it myself under his guidance. Incredible service, great company.
Jul 2025
We needed to replace a 20+ year old HVAC and were struggling to decide if we wanted an electric heat pump instead of a gas HVAC system. Grumpy's HVAC educated us on our options and worked with us to select a modern, eco friendly and energy efficient unit within our budget.
The old unit was replaced after having to take down part of our fence. When Grumpy's left, there was no signs they had been there and the fence was good as new. The new heat pump works like a charm and the first utilities bill of the summer disappointed PG&E when they did not get to take all my money.