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Year-Round Comfort · Grand Lake OK & NE Oklahoma
One system. All seasons. Efficient heating and cooling from a single unit — and we specialize in weird heat pump noises and defrost issues.
A heat pump is one system that heats and cools — it moves heat instead of burning fuel, which is why it fits Northeast Oklahoma's mild winters so well. Cozy Llama installs, repairs, and tunes air-source, ductless, and dual-fuel heat pumps across Grand Lake and NE Oklahoma, with an upfront price before we start. Ice on the unit, AUX heat stuck on, or lukewarm air? Start with the Defrost Decoder below, then call (918) 789-0427.
Interactive symptom checker
Heat pumps act differently than furnaces. What's "Drama" and what's normal?
See it work · interactive 3D
A heat pump moves existing heat from outside air into your home — it does not create heat, it transfers it. In summer it runs the same trick in reverse. Here's the same system in summer, in winter, and in the middle of a defrost cycle.
01 · Summer (cooling)
The indoor coil soaks up heat from your air. The big insulated copper line carries it outside, and the outdoor fan throws it out the top — that's the warm air you feel next to the unit.
The trick that makes it a heat pump is the reversing valve inside the outdoor unit. In winter, it flips.
The Armstrong Air A7CP21V in this demo, as rated by Armstrong Air:
02 · Winter (heating)
After that it stays in heating all winter. The whoosh you hear on cold days is defrost.
Unlike a gas furnace that blows 120°F air, heat pumps produce a 'gentle' heat (around 90-100°F).
Armstrong Air rates the A7CP21V for
03 · Defrost mode
In winter, it's normal for a heat pump to develop a light frost. The unit will automatically enter 'Defrost Mode' to melt it.
Typical timing. Armstrong Air says a defrost cycle lasts 5 to 15 minutes; every brand's control differs a little. With a dual-fuel system, your gas furnace is the backup heat instead of electric strips.
04 · When to call us
Illustration · Armstrong Air A7CP21V Pro Series heat pump + 7AH2AV air handler
How we work
We don't leave you in the cold. We head over ASAP to get the heat back on.
You get a firm quote before we touch a tool. No surprise bills.
We'll never sell you a repair you don't need. If it's not worth fixing, we'll tell you the truth.
We've partnered with Wisetack to offer flexible options. Finance projects up to $25,000 with terms from 3 to 60 months.
Prequalify in 60s
Does not affect credit score
Llama Loyalty Members get priority "Front of the Line" service during winter storms.
VIEW PLANSDual-Fuel is the Grand Lake Sweet Spot: NE Oklahoma gets maybe 10-15 days per winter below 25°F — the point where heat pumps lose efficiency. A dual-fuel system automatically switches to gas furnace backup only on those coldest days, then back to the efficient heat pump when temps rise. The heat pump carries the mild days and gas takes the coldest ones, which can lower your yearly heating costs compared to gas alone — how much depends on your gas and electric rates. We have been installing dual-fuel systems since 2022 and it is our most-recommended setup for Grand Lake homes.
We install, repair, and tune heat pumps and dual-fuel systems in Grove, Jay, Langley, Ketchum, Disney, Monkey Island, Cleora, Eucha, and Bernice. Our Eucha shop is 15–35 minutes from most Grand Lake O' the Cherokees communities, so a defrost problem or an AUX-heat question is a short trip for us.
In Grove? See heat pump installation and repair in Grove, OK for which setup fits a Grove home. The Grand Lake HVAC hub covers the rest of the lake.
Cozy Llama provides expert heat pump installation & repair service across NE Oklahoma. Click your town to learn more about HVAC services in your area.
Heat pump repair, installation & maintenance across Grand Lake and Northeast Oklahoma — air-source, ductless, and dual-fuel systems. Call for heat pump service:
📞 (918) 789-0427or book online