What Is a Heat Pump and How Does It Work? Best Simple Guide for Las Vegas Homes

A heat pump is a heating and cooling system that moves heat instead of making it. In summer it pulls heat out of your home and sends it outside, just like an air conditioner. In winter it reverses and pulls heat from the outdoor air into your home. Because it moves heat rather than burning fuel, a heat pump can deliver more heat energy than the electricity it uses.

In Las Vegas, heat pumps are common because winters are short and mild. One outdoor unit handles both seasons, and many valley homes have no gas furnace at all.

How Does a Heat Pump Work?

A heat pump uses refrigerant to carry heat from one place to another. Refrigerant absorbs heat when it evaporates and releases heat when it condenses. The compressor and valves control where that happens.

In cooling mode

1. Cool, low pressure refrigerant flows through the indoor coil.
2. It absorbs heat from your home’s air and turns to gas.
3. The compressor squeezes the gas, raising its temperature.
4. The hot gas flows to the outdoor coil and releases heat outside.
5. The refrigerant cools, passes through an expansion device and returns indoors.

In heating mode

A reversing valve flips the direction of refrigerant flow. Now the outdoor coil absorbs heat from the outside air, even on a cold morning, and the indoor coil releases that heat into the house.

Defrost cycle

On cold, damp mornings, frost can form on the outdoor coil. The heat pump briefly switches to cooling mode to melt it. You may see steam from the outdoor unit. That is normal.

What Are the Main Parts of a Heat Pump?

Most parts match a central AC, with a few additions.

Is a Heat Pump Good for Las Vegas?

Yes, for most homes. The valley has many winter nights near or below freezing but few long cold spells. Heat pumps handle that well. The U.S. Department of Energy notes that air source heat pumps can reduce electricity use for heating compared with electric resistance heating such as furnaces and baseboard heaters.

Benefits in the desert

• One system for heating and cooling
• No gas line needed
• Efficient heating on mild winter days
• Same cooling performance as a comparable AC

Things to know

• Auxiliary heat strips use a lot of electricity if they run often
• The outdoor unit works year round, so maintenance matters
• Air from the vents in heat mode feels warm but not hot like a gas furnace

What Are the Types of Heat Pumps?

Three types cover nearly every home.

Ducted air source heat pump

The most common type in the valley. It uses your existing ducts.

Ductless mini split heat pump

Wall or ceiling heads serve each room or zone. Great for casitas, garages and additions. See what is a mini split.

Packaged heat pump

All parts in one box, often on the roof. Common in older valley homes and townhomes.

How Efficient Is a Heat Pump?

Heat pumps have two ratings. SEER2 measures cooling efficiency. HSPF2 measures heating efficiency. Federal rules require at least 14.3 SEER2 and 7.5 HSPF2 for new split heat pumps. Our guide on what is SEER2 explains the numbers.

How Long Does a Heat Pump Last?

Many last about 10 to 15 years with good care. Because they run in both seasons, they often log more hours than a straight AC. ENERGY STAR suggests considering replacement when a heat pump is more than 10 years old. See how long AC units last for what shortens life in the valley.

What Problems Do Heat Pumps Have?

Most heat pump problems are the same as AC problems, plus a few of their own.

• Reversing valve stuck in one mode
• Defrost control failure
• Auxiliary heat running too often
• Thermostat not set up for heat pump control

If your heat pump blows hot air in summer, see why is my AC blowing hot air. If it blows cold air in winter, the defrost cycle or auxiliary heat may be the cause.

Should You Choose a Heat Pump or an AC With a Furnace?

It depends on your furnace age, your fuel and your budget. Our full comparison is in heat pump vs AC.

A Typical Las Vegas Call: Steam From the Outdoor Unit

An owner called on a cold, damp morning worried that the heat pump was smoking. It was the defrost cycle melting frost from the outdoor coil.

Nothing needed repair. The technician showed the owner how the defrost cycle works and how long it usually lasts. Knowing what is normal saves a service call.

Need Heat Pump Service in Las Vegas?

We connect callers with independent providers who repair, maintain and install heat pumps across the valley. For no heat or weak heat, see heating repair in Las Vegas. For a new system, see AC installation in Las Vegas, where providers install heat pumps and split systems. Heat pumps are common in all-electric homes across Spring Valley and Enterprise. For repair, see AC repair in Las Vegas.

Frequently Asked Questions

What is a heat pump in simple terms?

A heat pump is a system that moves heat. It pulls heat out of your home in summer and brings heat in from outside in winter, using one outdoor unit.

Does a heat pump work in cold weather?

Yes. It pulls heat from outdoor air even when it feels cold. In very cold conditions it may use auxiliary electric heat. Las Vegas winters are usually mild enough for heat pumps to work well.

Is a heat pump the same as an air conditioner?

In cooling mode, a heat pump works just like an AC. The difference is the reversing valve, which lets it also heat the home.

Why is steam coming from my heat pump?

That is usually the defrost cycle melting frost from the outdoor coil. It is normal on cold, damp mornings.

Are heat pumps expensive to run?

Heat pumps are often efficient for heating in mild climates. Costs rise if auxiliary heat strips run often, which can happen with a failing unit or a thermostat set up wrong.

How long does a heat pump last in Las Vegas?

Many last about 10 to 15 years with regular maintenance. They run year round, so care matters.

What is auxiliary heat on a heat pump?

Auxiliary heat is electric backup heat inside the air handler. It helps on very cold mornings or during defrost, but it uses more electricity.

Can a heat pump replace my furnace?

Yes. In Las Vegas many homes use a heat pump as their only heating and cooling system.