If your heating and cooling system is 15 years old or more, needs costly repairs often, or can’t keep your home comfortable, it’s likely time to replace it. In the Bay Area, most homeowners pay between $10,000 and $25,000 for a full new system, and some pay more. A gas furnace alone tends to run $6,000 to $12,000, while a heat pump that both heats and cools usually costs $15,000 to $30,000 installed. Your final price depends on your home’s size, your ductwork, and the type of system you pick.
Here’s what makes the Bay Area different. Labor costs here are among the highest in the country, so the same job can cost 20 to 40 percent more than it would in many other states. The rules are also shifting. Under current plans, the local air district will stop the sale of new gas furnaces starting in 2029, which is nudging more homeowners to switch to electric heat pumps. And since 2025, new AC and heat pump systems have had to use newer refrigerants. That raised prices on new units and made repairs on older systems cost more too. The choice you make now could shape your costs for the next 15 to 20 years.
Signs Your System Is Near the End
Age is the first clue. Most furnaces last 15 to 20 years, and most AC units and heat pumps last 10 to 15. If yours is in that range, start planning now instead of waiting for it to quit on the coldest night of the year.
Rising bills are another sign. An older system has to work harder to do the same job, so you pay more each month for less comfort. If your energy bills keep climbing while your usage stays the same, your system may be wearing out.
Pay attention to repairs, too. A simple rule of thumb is the “$5,000 rule.” Multiply the age of your system by the repair cost. If the number is over $5,000, replacing usually makes more sense than fixing. For example, a $400 repair on a 14-year-old unit gives you $5,600, which points to replacement.
Other red flags include rooms that never feel right, odd noises, a burning smell, or a yellow flame on a gas furnace. That last one can signal a carbon monoxide risk, so call a pro right away.
What a New System Costs in the Bay Area
Prices vary by city and home, but these are typical installed ranges for a single-family house:
- Gas furnace: $6,000 to $12,000
- Central AC: $8,000 to $15,000
- Furnace and AC together: $14,000 to $25,000
- Ducted heat pump: $15,000 to $30,000
- Ductless mini-split: $5,000 to $9,000 per room or zone
Ductwork is the wild card. If your ducts are old, leaky, or too small for a new system, replacing them can add $5,000 to $15,000. Many older Bay Area homes, especially those built before the 1980s, have ducts that need work. Ask your contractor to test them before you sign anything.
You’ll also likely need a permit, which can add a few hundred dollars depending on your city. Some homes need an electrical panel upgrade to handle a heat pump, and that can add $3,000 to $10,000.
Heat Pump or Gas Furnace?
Heat pumps make a lot of sense in the Bay Area. Our mild winters and warm (but rarely scorching) summers are a good match, since heat pumps work best when the weather isn’t too harsh. One unit handles both heating and cooling, and it runs on electricity, which pairs well with rooftop solar.
The main downside is the upfront cost, especially if you need a panel upgrade. A gas furnace is cheaper to install today, but it may not be the best long-term bet. With the 2029 rule on the way, parts and service for gas systems could get harder to find down the road. If you’re replacing a furnace now, ask your contractor whether a heat pump fits your home and budget.
Rebates and Ways to Save
The federal tax credit for heat pumps ended at the close of 2025, but local help may still be available. Bay Area utility and regional programs have offered rebates for heat pumps, panel upgrades, and better insulation. These programs change often and can run out of money, so check what’s open before you buy.
You can also save by getting at least three quotes and asking about off-season pricing, since fall and spring are often slower for contractors. Make sure the system is sized right, too. A unit that’s too big or too small wastes energy and wears out sooner. A good contractor will measure your home’s heating and cooling needs instead of just matching the size of your old unit.
Repair or Replace? The Bottom Line
If your system is under 10 years old and the repair is small, fixing it is usually the smart move. If it’s past 15 years, needs frequent fixes, or uses an older refrigerant that’s getting expensive, replacing it will likely save you money and stress over time.
Plan on $10,000 to $25,000 for most Bay Area homes, with heat pump setups and duct work pushing costs higher. Start getting quotes before your system fails so you have time to compare options and catch any rebates. A planned replacement almost always costs less than an emergency one in the middle of a cold snap or heat wave.
