AC vs. Heat Pump: A Comparison of Two Cooling Systems

When considering a heat pump or an AC for your Los Angeles-area home, a heat pump is often a strong choice, especially if you want a unit that heats as well as cools. That said, a traditional AC still makes sense in many cases, especially if your furnace has years left and you only need to upgrade your cooling system.

The right pick depends on your current furnace, your electricity and gas rates, and your home’s ductwork. This guide breaks down your options and helps you determine which type of system is best for your needs.

First: What’s the Difference Between a Heat Pump and an AC?

A heat pump and an AC cool a home the same way. Both use refrigerant to absorb heat from indoor air and release it outside, relying on a compressor, evaporator coil, condenser coil, and expansion valve. The main difference is a heat pump’s reversing valve. A reversing valve lets a heat pump run that process backward to warm your home, while an AC needs a separate furnace for heat.

How Do a Heat Pump and an AC Compare? 4 Factors to Consider

Since the cooling process is the same, the real differences show up in efficiency, cost, and upkeep.

1. Cooling Performance

In cooling mode, a heat pump performs like an AC because both rely on the same components. A properly sized unit handles summer heat either way, but sizing matters more than the type you choose. Our guide to AC sizing explains how a load calculation works.

2. Energy Efficiency

A heat pump moves existing heat instead of burning fuel, which is why the U.S. Department of Energy says it can provide comfort efficiently in all climates. Both units will carry a SEER2 rating for cooling efficiency (a higher number means lower cooling bills). Since January 1, 2023, most split-system ACs and heat pumps installed in California must reach at least 14.3 SEER2 under DOE efficiency standards.

3. Upfront Costs and Incentives

A heat pump generally costs more to install than an AC alone, since one unit does two jobs. The gap narrows when your furnace also needs replacing, because pairing a new AC with a new furnace means buying two pieces of equipment. Installed cost depends on the unit’s size and efficiency, your existing ductwork and wiring, and how easy the equipment is to reach.

The federal tax credit that once applied to heat pumps ended for installations after December 31, 2025, so quotes or articles that still promise it are out of date. State and utility rebates vary, so confirm what’s available before you commit.

4. Installation and Maintenance

Replacing an old AC with a new one is usually a simple swap. A heat pump can take more work, since older homes may need new control wiring, compatible refrigerant lines, or a matching air handler. Both benefit from yearly care: schedule AC service in spring before summer, and book heat pump service twice a year, before summer and before winter.

If you’re ready to start comparing equipment, our team can help walk you through your options and determine which is best for your home.

Do Heat Pumps Make Sense in Los Angeles?

Mild Los Angeles winters suit heat pumps well, because heating demand is modest and a heat pump handles it without a gas furnace. Hotter inland neighborhoods don’t change that, since a heat pump cools just as well as an AC. The less you use a heater, though, the smaller the heating benefit becomes, and a relatively new furnace that rarely runs may not be worth replacing yet.

If a furnace is part of your decision, our comparison of air-source heat pumps and natural gas furnaces covers that side of the choice.

How to Choose Between a Heat Pump and an AC

Not sure which option is right for you? Ask yourself these four questions to help decide.

• How old is your furnace? If it’s near the end of its life, replacing both with a heat pump often beats buying a new AC and a new furnace.
• How often do you heat your home? Where the heater rarely runs, a straight AC replacement may be enough.
• What do you pay for electricity and gas? Heat pump savings depend on how your electric rates compare with gas.
• Is your home ready for it? Ductwork condition, wiring, and electrical capacity affect both cost and which unit fits.

Our experienced team can usually help you answer the questions with a single walkthrough.

Find the Right Cooling Upgrade for Your Home

If you’re weighing a heat pump against an AC, Monkey Wrench Plumbing, Heating, Air & Electric can inspect your current equipment, explain how each option fits your house, and give you pricing before any work begins. Contact us today to get started.

Frequently Asked Questions About Heat Pumps vs. Air Conditioners

Can a heat pump cool a house in 100-degree weather?

Yes. In cooling mode, a heat pump works like an AC, so a properly sized unit handles extreme heat the same way. Sizing, ductwork, and insulation affect comfort on a 100-degree day more than the type of unit does.

Is a heat pump more expensive than an AC?

A heat pump usually costs more to install than an AC alone, since it handles both heating and cooling. The gap narrows when you’d otherwise need a new furnace too, and your total depends on the unit’s size and efficiency, ductwork, and wiring. Estimates arrive digitally before any work begins, and financing through GoodLeap and GreenSky can spread out the cost.

Do heat pumps need more maintenance than an AC?

A heat pump runs year-round, so it benefits from a tune-up twice a year, while an AC needs one before summer. Our Home Protection Plan costs $175 per year and includes a 20 touch point heating and cooling tune-up, no service call fee, and priority scheduling, which makes keeping up with maintenance easier.