WHEN TO REPLACE YOUR HVAC SYSTEM IN SAN FRANCISCO
Several clear signals indicate it is time to replace rather than repair your HVAC system in San Francisco. Age is the first factor — gas furnaces typically last 15–20 years. If your system is approaching or past this age, replacement is often more cost-effective than continued repairs. Repair cost is the second factor — if a single repair costs more than 50% of the system replacement cost, replacement usually makes more financial sense. Efficiency decline is the third factor — older systems lose efficiency over time. If your energy bills have risen significantly without a change in usage, your system may be working harder to deliver the same results. Refrigerant type matters for AC systems — systems using R-22 refrigerant (phased out in 2020) are increasingly expensive to maintain and parts are becoming unavailable. Comfort issues — uneven heating or cooling, excessive humidity, or hot and cold spots — often indicate an aging or improperly sized system. Finally, San Francisco's all-electric building trend is accelerating. If you're planning any renovation work, replacing a gas furnace with a heat pump now (while significant rebates are available) is strategically smart — SF is moving toward all-electric requirements for renovated buildings.
CHOOSING THE RIGHT HVAC SYSTEM FOR YOUR SAN FRANCISCO HOME
San Francisco homeowners have several HVAC options when replacing an existing system. Option 1: Gas furnace replacement. The traditional choice — reliable, well-understood, and typically the lowest upfront cost. Best for homeowners not planning renovations who want a simple like-for-like replacement. A 96% AFUE high-efficiency furnace is the minimum we recommend for new SF installations. Option 2: Heat pump replacement. Replace your gas furnace with an all-electric heat pump that provides both heating and cooling. Higher upfront cost but qualifies for $7,500+ in rebates, eliminates gas bills, provides AC (which SF increasingly needs), and aligns with SF's all-electric direction. This is our recommendation for most SF homeowners planning to stay in their home for 5+ years. Option 3: Mini-split system. For homes without existing ductwork or for specific zones (ADUs, additions, bonus rooms), a ductless mini-split heat pump is often the most practical and cost-effective solution. Option 4: Hybrid system. A heat pump paired with a gas furnace backup — the heat pump handles most of the work while the gas furnace provides backup on the coldest days. Less relevant in SF's mild climate but useful in colder Marin County locations. Solid Bay will assess your specific home — existing system, ductwork condition, electrical panel capacity, budget, and long-term plans — and recommend the right system for your situation.