Featured brand: Trane
Trane Heat Pumps: One System That Heats and Cools, With Backup When Missouri Bites
A heat pump is an air conditioner that runs in both directions: cooling in summer, and in winter it moves heat from outdoor air into the house instead of burning fuel to make it. Modern Trane heat pumps heat efficiently through the large majority of a St. Louis-metro winter, and for the coldest stretches, a dual-fuel setup keeps a gas furnace underneath as backup.
Heat pumps & dual-fuel pairings
What it is
In heating mode the refrigerant cycle reverses: even cold outdoor air holds extractable heat, and the heat pump concentrates it indoors. Efficiency falls as temperatures drop, which is why system design, balance point, backup heat, controls, matters more than the badge on the cabinet.
Dual fuel is the configuration we recommend most often for gas-served homes here: the heat pump carries the season's mild and moderate days at electric-efficiency prices, and the control hands off to the gas furnace when outdoor temperatures make gas the cheaper BTU. All-electric designs with supplemental heat strips fit homes beyond the gas mains, common in western St. Charles, Lincoln, and Warren County, where propane costs usually make the heat pump the winning math.
Sizing is everything: a heat pump sized for cooling alone can run short of heat in January, and one oversized for summer will short-cycle and dehumidify poorly. We run the load calculation both directions before quoting.
The efficiency story
Heating and cooling efficiency, against the fixed anchors
Heat pump ratings run on two scales, SEER2 for cooling, HSPF2 for heating. The anchors below are statutory and program thresholds; your exact AHRI match carries its exact numbers.
Anchors are the DOE 2023 federal minimums for split heat pumps and Ameren Missouri's published PAYS eligibility threshold. We quote each system's certified SEER2 and HSPF2 in writing, and dual-fuel handoff points get set for your actual utility rates.
Who it fits
Which St. Louis-metro homes this actually serves
Not sure where your house lands? Take the two-minute Which System Fits Your Home walkthrough, it's built on the same honest logic.
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Gas-served homes ready for dual fuel
Keep the furnace, add efficient electric heat for the 40-degree days that make up most of our winter, the handoff is automatic.
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Propane and all-electric properties
Beyond the Spire mains, New Melle, Defiance, Innsbrook, Lake Sherwood country, heat pump economics usually beat propane decisively.
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Homes replacing both AC and furnace at once
When both systems are due, the incremental cost of a heat pump over a straight AC is at its smallest, the best moment to make the move.
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Efficiency-driven owners
One system doing both jobs, rebate-eligible through Ameren's PAYS program when the match qualifies.
The honest ledger
Pros, and the considerations the brochure skips
Why homeowners pick it
- + Heats and cools with one outdoor unit, and heats efficiently through most of a Missouri winter
- + Dual-fuel keeps gas backup for the coldest snaps, using each fuel where it's cheapest
- + Strong fit for propane and all-electric homes where fuel costs punish the status quo
- + Rebate-eligible tiers under Ameren's published PAYS program rules
Worth weighing first
- − Ameren's program doesn't fund fuel switching, homes with non-electric heat keep that fuel as primary or backup, which is exactly what dual-fuel does
- − Cold-snap performance depends on design: balance point, backup capacity, and controls have to be set deliberately
- − Winter supply air runs cooler than a gas furnace's blast, normal, but worth knowing before you buy
- − Electric panel capacity needs checking on older homes before an all-electric design
Savings that may apply
Rebates & incentives for this equipment
Program figures below come from published utility program documents and change by program year, eligibility conditions are real, so we confirm what your project qualifies for before you count on a number. Financing options live on Rebates & Financing .
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Ameren Missouri · Pay As You Save (PAYS)
Up to $2,500 per systemAir-source & dual-fuel heat pumps
Ameren Missouri's PAYS program rebates qualifying air-source heat pumps rated 15.2+ SEER2, including dual-fuel heat pumps with gas backup and heat pumps replacing electric-resistance heat. Ground-source systems have their own, larger tier.
- Qualifying 15.2+ SEER2 equipment (AHRI-rated)
- PAYS program participation with a usage analysis, you must have lived in the home for the past 12 months
- Existing unit at least 10 years old, rated 14 SEER or less, or no longer working
- Homes with non-electric heat keep that fuel as primary or backup, the program does not fund fuel switching
Amounts and rules come from Ameren Missouri's published 2026 PAYS rebate charts and change by program year, we confirm current eligibility and amounts for your project before you count on a figure. Ameren Missouri PAYS rebates
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Ameren Missouri · Pay As You Save (PAYS)
$250 per thermostatSmart thermostats
ENERGY STAR (or Ameren-approved) smart thermostats carry their own PAYS rebate, an easy add-on when new equipment goes in, and one of the most practical upgrades for part-time and lake homes.
- ENERGY STAR certified or on Ameren's approved list
- PAYS program participation
Amounts and rules come from Ameren Missouri's published 2026 PAYS rebate charts and change by program year, we confirm current eligibility and amounts for your project before you count on a figure. Ameren Missouri PAYS rebates
Keep learning
Related guides & comparisons
- Which system fits your home? →
- Heat pump vs furnace →
- Dual fuel vs heat-pump-only →
- How heat pumps work →
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