Harry Clark Heating and Air Conditioning

Harry Clark Heating and Air Conditioning has served Oakland homeowners since its founding, earning a 4.7-star rating across 17 reviews. The contractor operates a Monday through Friday schedule, 7:30 AM to 4:30 PM, and handles projects ranging from targeted thermostat repairs to complete heat pump retrofits. Don Marshall, the owner, personally conducts initial home assessments, a process one reviewer described as lasting an hour and a half in a 1908 Oakland residence. The company works on both aging gas furnaces and modern variable-speed heat pumps, including two-zone systems that allow independent temperature control for separate areas of a home.

The company has partnered with QuitCarbon to offer free heat pump design services that include system sizing, pricing, and access to available utility rebates. This coordination allows homeowners considering a heat pump retrofit to receive a comprehensive cost analysis before committing to installation. Harry Clark's crews handle the full installation sequence, from removing an old gas furnace to commissioning the new system and verifying zone-by-zone performance. The company also manages parts sourcing and coordinates warranty replacements when defective components appear, as demonstrated when project manager Matt Schwoyer resolved an air handler issue by arranging a supplier replacement within one week.

Armando Hernandez and his crew completed a full heat pump upgrade in an Oakland home over five working days, installing a two-zone system with what the homeowner described as excellent workmanship. During the project, Armando answered numerous technical questions while working around the existing structure of a 1908 residence. In a separate case, Fred Whale called Harry Clark for a second opinion after another contractor quoted $6,500 for a full furnace replacement. Rather than recommending an immediate swap, Harry Clark diagnosed the actual problem as a faulty thermostat, replaced it along with the air filter, and restored the aging furnace to full operation at a fraction of the cost.