How does the system decide which to use?
The control uses a switchover point — sometimes called the balance point — set during commissioning. Above it, the heat pump runs; below it, the furnace takes over. The point is chosen by comparing the heat pump's efficiency at a given outdoor temperature against the cost of running the furnace, using your actual electric and gas rates.
That last part matters and is often skipped. The right switchover for your house depends on your MidAmerican Energy rates, not a factory default. We set it from your numbers and revisit it if rates change materially.
Why does this pairing suit central Iowa?
Look at how our heating season actually distributes. A large share of heating hours in Des Moines fall in the 25-50°F range — October through early December, and again in March and April. A heat pump is at its most efficient in exactly that band, often delivering two to three units of heat per unit of electricity.
Then January arrives. Below roughly 20-25°F a heat pump's capacity and efficiency drop, and a gas furnace becomes both cheaper and more capable. A dual-fuel system lets you use each where it wins instead of compromising with one for the whole year.
What does it cost compared to a standard system?
You are buying a heat pump instead of a straight air conditioner, plus a furnace, plus a control capable of managing the changeover. The outdoor unit does double duty — it is your air conditioning in summer — so the incremental cost is the heat pump premium over an AC, not the price of a whole extra system.
Whether it pays back depends on your rates, your home's envelope, and how long you plan to stay. We would rather run that comparison honestly for your house than assert that hybrid is always the answer, because sometimes a good furnace and a good AC is simply the better value.
What should I watch out for?
Two things. First, thermostat compatibility: a dual-fuel system needs a control that understands the changeover logic, and pairing it with a basic thermostat can leave both pieces of equipment running at the wrong times.
Second, deep setbacks. As with any heat pump, dropping the temperature 10°F overnight can force expensive recovery. Use modest setbacks, or a thermostat that stages the recovery intelligently.
Frequently asked questions
Does a dual-fuel system qualify for rebates?
Often yes — heat pumps are frequently the focus of utility and federal incentive programs, and qualifying efficiency tiers can be attractive. Programs and thresholds change annually, so we verify current MidAmerican Energy and federal offerings when quoting and handle the filing for you.
Will I notice when it switches over?
Some people notice that furnace heat feels warmer at the register. A heat pump delivers air at a lower temperature than a furnace does — comfortable and effective, but not the hot blast people associate with gas heat. It is a difference in feel, not a fault, and most households stop noticing within a season.
Can I add a heat pump to my existing furnace?
Sometimes. If your furnace is in good condition and reasonably young, replacing an aging air conditioner with a heat pump and adding a compatible control can create a dual-fuel system without touching the furnace. Whether that works depends on the furnace's controls and age, which we can check during an assessment.
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