Plenty of homeowners in Dover and Spring Grove like their furnace. It’s reliable, it puts out strong heat on the coldest nights, and they aren’t ready to give it up. But they’re also curious about heat pumps and the efficient heating they offer in milder weather. A dual fuel system lets you have both.
The short answer: A dual fuel (or hybrid) system pairs an electric heat pump with a gas or propane furnace. The heat pump handles heating during milder weather, and the furnace takes over when it gets colder outside, at a switchover point set during installation. You get efficient heat for much of the season plus the strong, steady heat of a furnace on the coldest days, all controlled automatically.
How a Dual Fuel System Works
A dual fuel system has three main parts:
- An outdoor heat pump that heats in winter and cools in summer, replacing a standard central air conditioner.
- A gas or propane furnace inside that provides heat when it’s cold and moves air through your ducts year-round.
- A compatible control that decides which one runs based on outdoor temperature and other settings.
The two never fight each other. When it’s mild out, the heat pump runs. When the temperature drops below the switchover point, the control shuts the heat pump down and fires the furnace. In summer, the heat pump runs in cooling mode just like an AC.
What Is the Switchover (Balance) Temperature?
The switchover point is the outdoor temperature at which your system stops using the heat pump and starts using the furnace. There’s no single correct number. The right setting depends on:
- Your heat pump’s cold-weather performance. Newer systems keep working well in colder temperatures than older ones.
- Your fuel prices. What you pay for electricity versus natural gas or propane changes the math.
- Your home. Insulation, air leaks, and size affect how much heat you need on a cold day.
- Your comfort preferences. Some people prefer the warmer-feeling air from a furnace and set a higher switchover point.
During installation, we help you pick a starting point, and it can be adjusted later as fuel prices or your preferences change. To understand how heat pump output changes as the weather gets colder, see our post on at what temperatures a heat pump will work.
Benefits of Dual Fuel
Efficient heat in mild weather
A large part of a York County heating season is spent in the 30s, 40s, and 50s. Heat pumps are often very efficient in that range, since they move heat instead of burning fuel to make it.
Strong heat on the coldest nights
When temperatures drop well below freezing, the furnace takes over and delivers the heat you’re used to.
Flexibility with fuel costs
Gas, propane, and electric prices change over time. A dual fuel system gives you two energy sources, and the switchover point can be adjusted to fit.
Backup if one side needs service
If the heat pump needs a repair, the furnace can often carry the load, and vice versa, so you aren’t left with no heat at all.
Year-round comfort
The heat pump doubles as your air conditioner, so one outdoor unit covers both summer and the milder parts of winter.
Is Dual Fuel a Good Fit for Your Home?
Dual fuel tends to make the most sense when:
- You already have a gas or propane furnace in good shape, or you’re replacing one anyway.
- Your central air conditioner is aging and due for replacement.
- You use propane and want to reduce how much you burn.
- You want heat pump efficiency but aren’t comfortable relying on one for every winter night.
If your furnace is near the end of its life, it may make sense to replace both together. Our furnace installation page covers what that process looks like.
It may be less of a fit if you have no ductwork (ductless options may work better) or if your furnace and AC are both fairly new.
What to Expect During Installation
A dual fuel installation starts with a free estimate. We’ll look at your existing furnace, ductwork, electrical service, and the space around your outdoor unit. If your furnace is staying, we check that it’s compatible and in good condition. Then we’ll recommend equipment sized for your home.
As a Trane Comfort Specialist, we install Trane heat pumps and furnaces that are designed to work together. Trane equipment comes with a 10-year parts warranty, and Trane furnaces include a limited lifetime heat exchanger warranty. We back our installs with a 5-year labor warranty. Financing is available on new systems, and military households get a 10% discount on installs, not combinable with other offers.
Learn more about the heat pumps we install on our heat pumps page.
Frequently Asked Questions
What is a dual fuel heat pump system?
It’s a heating and cooling system that pairs an electric heat pump with a gas or propane furnace. The heat pump runs in milder weather, and the furnace takes over when it gets colder.
Can I add a heat pump to my existing furnace?
Often, yes, if the furnace is compatible and in good condition. A technician will check your furnace, ductwork, and electrical service during a free estimate.
At what temperature does a dual fuel system switch to the furnace?
There’s no single number. The switchover point is set during installation based on your heat pump, fuel prices, home, and comfort preferences, and it can be adjusted later.
Does dual fuel work with propane?
Yes. Dual fuel works with both natural gas and propane furnaces, and many propane homeowners choose it to reduce how much propane they use.
Does a dual fuel system also provide air conditioning?
Yes. The heat pump cools your home in summer, just like a central air conditioner.
Curious About Dual Fuel for Your Home?
Air Comfort Technologies is a family-owned company that has served Dover, Spring Grove, York, Manchester, and nearby towns since 2015. With a 4.9-star rating from 400+ Google reviews, we’ll help you decide whether dual fuel fits your home and budget. Call us at (717) 855-4101 for a free estimate.