Real warmth on the coldest nights — without a flame in the house
- ■Rated operating rangeHeating to −13 °F outdoor
- ■Full-capacity threshold0 derate down to 5 °F
- ■Capacity tiers2.3 – 9.5 tons
- ■Heating efficiencyCOP up to 4.6
Mountain and northern homes ask one honest question of any heating system: what happens at 20 below? Our cold-climate platform is the all-electric heart of Waterless Radiant — an inverter air-source heat pump engineered to keep extracting heat from frigid outdoor air long after older systems give up. Enhanced vapor injection (EVI) and supercooling let it run down to −13 °F and hold full rated heating output all the way to 5 °F, so on a normal hard winter day there is no struggle and nothing burning in your home. We pair it with a low-temperature radiant floor, the ideal match for an air-source heat pump, and size every system to your climate zone and envelope. For the few genuinely brutal peak hours each winter, we design intelligent backup rather than pretend it never matters — that honesty is part of the comfort. No gas line, no flue, no combustion: heating and cooling from one quiet, all-electric platform purpose-built for your quality life.
What Sets Our Cold-Climate Air-Source Heat-Pump Platform Apart
Inverter EVI + supercooling for deep cold
A variable-speed inverter compressor with enhanced vapor injection injects extra refrigerant mid-compression, pulling usable heat from air most systems can't touch. This is the engineering that turns 'air-source heat pumps don't work up here' into a system rated to operate to −13 °F.
Zero capacity derate down to 5 °F
Many air-source heat pumps quietly lose output as the mercury falls, leaning on electric resistance backup by the time it hits the teens. This platform holds full rated heating capacity all the way down to 5 °F — covering the vast majority of cold-climate winter hours at full strength.
Honest, intelligent backup for peak cold
We don't claim you'll never need backup. For the handful of hours each winter at the extreme bottom of the range, your system is designed with right-sized supplemental heat that engages seamlessly. You stay warm on the worst night of the year — by design, not by luck.
All-electric, ahead of the gas phase-out
No gas line, no flue, no carbon monoxide, no combustion in your home. As more jurisdictions tighten furnace rules and push new construction all-electric, you're already on the right side of the trend — and free of the rising cost of ultra-low-NOx gas compliance.
Radiant floor: the air-source heat pump's best partner
A low-temperature radiant floor needs only a modest supply temperature, which is exactly where an air-source heat pump runs most efficiently. The result is gentle, even, draft-free warmth and a system that earns its high heating COP instead of fighting against high-temperature emitters.
Modern low-GWP refrigerant
Available with the current low-GWP A2L refrigerants used in new North American systems (such as R-32 and R-454B) — engineered for today's refrigerant standards.
Technical Specifications
- Inverter compressor
- EVI circuit
- Variable-speed fans
- ■Mountain and ski-country custom homes facing routine sub-zero winter nights
- ■Northern and Midwest high-end residences replacing aging gas or propane furnaces
- ■All-electric new construction in jurisdictions phasing out gas heating
- ■Cold-climate renovations where homeowners want radiant comfort without a hydronic water loop
Carrying a cold-climate home through an extended deep freeze
Challenge
A high-end home in a mountain climate zone needed all-electric heating that owners could trust through prolonged sub-zero stretches — without the freeze and burst risk of hydronic radiant, and without a gas furnace as a crutch.
Solution
An inverter EVI cold-climate air-source heat pump sized to the home's load and envelope, feeding a low-temperature waterless DX radiant floor, with right-sized supplemental heat engineered in for the extreme peak hours.
Result
The system held comfortable, even indoor temperatures through an extended deep-freeze event, running on the air-source heat pump for the great majority of hours and calling on backup only briefly at the coldest extremes — all electric, with no combustion and no water-loop freeze exposure.
Frequently Asked Questions
Yes. The platform is engineered with an inverter compressor, enhanced vapor injection, and supercooling specifically so it keeps extracting heat from extremely cold air — it's rated to operate in heating mode down to −13 °F. It also holds full rated heating capacity all the way to 5 °F, so on a typical hard winter day there is no drop-off at all. Performance always depends on your climate zone, building envelope, and proper sizing, which is why we engineer each system per region rather than ship one nationwide spec.
For most cold-climate homes, the air-source heat pump carries the house through the great majority of winter on its own. We're honest about the exception: during the few genuinely extreme hours each winter — at the very bottom of the temperature range — your system is designed with right-sized supplemental heat that engages seamlessly. We design that backup in deliberately rather than claiming you'll never need it. You stay comfortable on the coldest night without oversizing or overspending the rest of the season.
An air-source heat pump's efficiency does taper as outdoor temperatures fall — that's physics. What sets this platform apart is how gently it tapers: EVI and supercooling keep it productive in deep cold, and it can reach a heating COP of up to 4.6, meaning far more heat delivered than electricity consumed. Pairing it with a low-temperature radiant floor helps it run in its efficient sweet spot, since the floor needs only modest supply temperatures.
Yes — it's a complete, all-electric replacement for furnace heating, with no gas line, no flue, and no combustion in your home. One platform handles both heating and cooling. As more regions phase out new gas furnaces and tighten emissions rules, an all-electric cold-climate air-source heat pump positions your home ahead of the change and avoids the rising cost of compliant gas equipment.
The air-source heat-pump platform is purpose-matched to a refrigerant-direct radiant floor instead of ducts or high-temperature water loops. Hot refrigerant goes straight into embedded copper floor loops, so there's no water to freeze or burst and no plate-exchanger or circulating-pump losses. You get the deep-cold capability of a premium inverter air-source heat pump plus the quiet, even comfort of a radiant floor — in one all-electric, waterless system.
A heat pump moves heat rather than burning fuel, achieving a COP of 3.0+ in mild weather versus a gas furnace's 80-95% efficiency. In cold climates, modern cold-climate heat pumps maintain COP above 2.0 at -15°C, but gas furnaces may have lower upfront cost. The breakeven depends on local utility rates and climate.
Hydronic floor heating costs $6-12 per square foot installed, while waterless DX radiant floor systems run $8-15 per square foot. Retrofits add a 20-30% premium. For a 1,400 sq ft home, total cost ranges from $10,000 to $25,000 depending on system type and slab access.
A full service upgrade from 100 amps to 200 amps costs $2,000–$5,000 installed. Smart panels range from $2,500–$4,500, while load management devices cost $300–$800. A proper load calculation per NEC Article 220 may show no upgrade is needed, saving the entire cost.
Load management devices cost $300–$800 and are cost-effective for homes with a single high-draw heat pump. A full upgrade becomes more economical if you plan to add multiple large loads like an EV charger or induction range within five years, as the $2,000–$5,000 investment avoids separate upgrades later.
Explore More Capabilities
Heat, Cool & Hot Water — One System
Most luxury homes end up with two mechanical systems fighting for space, budget, and attention: radiant or hydronic heat for winter, and a separate air-conditioning system bolted on for summer. Waterless Radiant settles the question. A single inverter air-source heat pump drives refrigerant directly through copper capillary coils in your floor for invisible, draft-free warmth all winter — then, in summer, the same platform delivers cooling through discreet, ultra-quiet indoor air handlers. Add domestic hot water and one system handles all three. There is no second condenser to hide outside, no competing thermostats, no mismatched comfort. You design once, install once, and own one coordinated system that holds the whole house steady year-round — purpose-built for the way you actually live in your home.
Learn more →Waterless DX radiant heatingWaterless Radiant Floor Heating
Waterless radiant floor heating gives you the quiet, even warmth of a heated floor with none of the water risk that traditional hydronic systems carry. Instead of pumping heated water through the floor, our system sends refrigerant directly through a weld-free copper loop network embedded just beneath the surface, so the floor itself becomes a gentle radiant emitter. There is no boiler, no buffer tank, no circulating pump, and no antifreeze. And because there is no water in the floor, there is nothing to leak, scale, or freeze and burst. The result is the comfort affluent homeowners want, heat that rises evenly from the floor with no drafts, no forced-air noise, and warmth from the moment you step out of the shower, paired with the efficiency of a modern air-source heat pump. It is radiant comfort, purpose-built for your quality life.
Learn more →Industries Using Cold-Climate Air-Source Heat-Pump Platform
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