Serving Church Hill, TN & the Tri-Cities Mon–Fri 8–5 · Emergency service available (423) 357-1922
Custom Heating & Air Conditioning logo Heating & Air ConditioningChurch Hill, TN · Since 2001
Heating & cooling

A heat pump is an air conditioner that can also run in reverse, and that is why it is the most efficient way to heat a house in a climate like ours.

Because a heat pump works year-round it accumulates roughly double the run hours of a system that only cools. That shows up as earlier wear on compressors, contactors, capacitors and reversing valves, and it is why heat pumps need service twice a year rather than once.

The faults we see most are defrost-cycle problems, reversing valves sticking between modes, and auxiliary strip heat running when it should not be, which can triple an electricity bill without any warning. All three are diagnosable in a single visit.

We service, repair, maintain and replace heat pumps of every brand, including ductless mini-splits and dual-fuel systems paired with a gas furnace.

Modern heat pumps installed outside a home
  • Carrier factory-authorized dealer
  • NATE certified technicians
  • Better Business Bureau
What we cover

What heat pump service covers

  • All brands repaired
  • Defrost board and sensor faults
  • Reversing valve diagnosis and replacement
  • Auxiliary and emergency heat verified
  • Ductless and mini-split heat pumps
  • Dual-fuel changeover set correctly
  • Cold-climate heat pump installation
  • Spring and fall maintenance visits
At a glance

What is normal, and what is not

We recommend service twice a year, because a heat pump runs roughly double the hours of a system that only cools. We work on all brands, including ductless mini-splits and dual-fuel systems paired with a gas furnace.

Normal

Steaming outside in winter
That is the defrost cycle melting ice off the outdoor coil.
Cool air from the vents
Heat pump supply air feels cool against your hand while still heating the house.

Worth a call

Staying iced over, or defrosting constantly
A normal defrost cycle clears the coil and then stops.
Emergency heat on by itself
In mild weather this is not normal. Backup strip heat running unnoticed can triple an electricity bill.
How it works

How a repair visit works

  1. You call the office

    Tell us what the system is doing, and we will let you know the diagnostic fee before we come out.

  2. We find the real fault

    A NATE-certified technician tests the system and pinpoints the cause before any parts are replaced.

  3. You decide

    We explain what the repair will cost, and the decision is yours. On an older unit, we show you the repair-versus-replace numbers as well.

  4. We fix it

    We carry common parts on our trucks, so many repairs are finished on the first visit.

How a heat pump works

One system, two directions

In summer it moves heat out of the house. In winter it reverses and brings heat in.

Summer It pulls heat out of the house and releases it outdoors, like any air conditioner.
Winter It runs in reverse, gathering heat from the outdoor air and moving it inside.
Defrost In cold, damp weather the outdoor coil ices up, so the unit briefly reverses to melt it off. The steam is that ice evaporating.
We service, repair, maintain and replace heat pumps of every brand.
Custom Heating & Air Conditioning, LLC Family owned in Church Hill, Tennessee, since 2001
2001Serving since
100+Years combined experience
2,712Customer reviews
30+Towns covered
Common questions

Before you book

Why is my heat pump steaming outside in winter?

That is the defrost cycle, and it is normal. The outdoor coil ices up in cold damp weather, so the unit briefly reverses to melt it off. The steam is that ice evaporating. What is not normal is the unit staying iced over, or defrosting constantly.

What is emergency heat and when should I use it?

Emergency heat locks out the heat pump and runs the backup electric strips or furnace alone. Use it only when the heat pump has failed — it is far more expensive to run. If your system is calling for it by itself in mild weather, something is wrong.

How long do heat pumps last?

Typically twelve to fifteen years here, a little less than a cooling-only system because of the year-round run hours. Twice-yearly maintenance is the single biggest factor in reaching the top of that range.

Are heat pumps any good in an East Tennessee winter?

Modern ones, yes. Cold-climate models hold useful capacity well below freezing — a long way from the reputation heat pumps earned in the 1990s. Below the changeover point a dual-fuel setup hands over to a gas furnace, which is often the ideal arrangement here.

Prefer to call?

(423) 357-1922
Office hours
Monday to Friday, 8–5
Outside those hours
Emergency service is available — call the same number.
Where we go
Church Hill, Kingsport, Mount Carmel, Surgoinsville, Rogersville, Johnson City, Bristol, Greeneville, Morristown and across into Southwest Virginia. Full service area.
Where we are
119 E Main St, Church Hill, TN 37642
Thank you — we have your request.
We will call you back to confirm a time. If it is urgent, call (423) 357-1922.

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Tell us what the system is doing and we will call you back to schedule. For a no-heat or no-cool emergency, please call us instead. It is the fastest way to reach us.

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Monday to Friday 8–5, with emergency service available outside those hours.

(423) 357-1922
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