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How Heat Pumps Work in Monrovia and the San Gabriel Valley
How a Heat Pump Moves Heat in a Mild Southern California Climate
Published: 07/14/23
Updated: 11/13/26
Call (626) 357-3535 to talk through how a heat pump would work on your Monrovia or San Gabriel Valley house.
Most homes in Monrovia and the San Gabriel Valley were built with a separate air conditioner for summer and a furnace for winter. A heat pump does both jobs with one outdoor unit. In cooling mode, it moves heat from inside the house to the outdoor air. In heating mode, it reverses the cycle and moves heat from the outdoor air into the house. The equipment does not create heat by burning fuel. It relocates heat that already exists.
Air-Tro has installed and serviced heating and cooling systems since 1969. The explanation below is the one we walk through with homeowners who are deciding whether a heat pump fits their house. For more on local installation and service for your specific address, start with heat pump installation and service in Monrovia and the San Gabriel Valley.
Want the equipment sized for your house? Call (626) 357-3535.
How a Heat Pump Works in Summer and Winter
In summer, the outdoor unit acts like a standard air conditioner. It pulls heat from the indoor air and releases it outside. In winter, the reversing valve switches the cycle. The outdoor unit extracts heat from the outdoor air – even when that air feels cool – and moves it indoors. A heat pump moves heat rather than generating it, which is why it can deliver several units of heating for every unit of electricity it consumes when conditions are favorable.
In Monrovia and the rest of the San Gabriel Valley, the outdoor air rarely drops into the range where a modern heat pump needs heavy backup heat for long periods. That is the practical advantage of the mild climate. The same unit that cools the house in August can heat it in January without a separate furnace running most of the time. For more detail on how the systems perform when temperatures drop, see how heat pumps perform in Monrovia winters.
One System Instead of Two
A conventional setup uses an air conditioner for cooling and a furnace for heating. A heat pump replaces both for most of the year. Some homeowners keep the existing furnace as backup and let the heat pump handle the majority of the heating and all of the cooling. That dual-equipment arrangement is one option. Others replace both the furnace and the air conditioner with a single heat pump. The choice depends on the condition of the existing furnace, the ductwork, and how the house is used.
For the full comparison when a furnace is already in place, visit heat pump versus a new air conditioner when you already have a furnace. For shorter answers to the questions we hear most often, see common heat pump questions for Monrovia and San Gabriel Valley homes.
Why the Mild Climate Matters
Heat pumps are most efficient when the outdoor temperature stays in a moderate range. In Monrovia, Pasadena, Arcadia, and the other San Gabriel Valley cities, that is the normal condition for most of the year. The cooling season is long and the heating demand is moderate. The equipment spends most of its time in the range where it can move heat efficiently rather than relying on electric resistance or a gas furnace. That is why many homeowners in the area are looking at heat pumps when it is time to replace an aging air conditioner or furnace.
The same mild climate also means the outdoor unit does not have to work as hard as it would in a colder region. Maintenance is focused on filters, coils, and the reversing valve – the same basic care we recommend for other heating and cooling equipment. Twice-a-year service, once before cooling season and once before heating season, keeps the system ready for the weather that stresses it most.
Where We Install and Service Heat Pumps
Our shop is located at 1630 S. Myrtle Ave. in Monrovia, and we install and service residential heat pumps in Monrovia, Pasadena, Arcadia, San Marino, Sierra Madre, Duarte, Bradbury, Altadena, Temple City, San Gabriel, South Pasadena, Glendora, and La Cañada Flintridge. We also provide service to Los Angeles commercial properties. Call (626) 357-3535 to schedule your service or learn more about whether a heat pump is the right choice for your home or business.
Frequently Asked Questions
How Does a Heat Pump Work?
It moves heat. In summer, it moves heat out of the house. In winter, it reverses the cycle and moves heat from the outdoor air into the house.
Do Heat Pumps Work Well in Monrovia and the San Gabriel Valley?
Yes. Mild winters mean a modern heat pump can meet most of the heating load while the same unit handles cooling.
Can a Heat Pump Replace Both My Furnace and Air Conditioner?
In many cases, yes. Some homeowners keep the furnace as backup. Others replace both with a single heat pump.
How Often Should a Heat Pump Be Serviced?
Twice a year – once before cooling season and once before heating season.
Where Do You Install Heat Pumps?
We cover Monrovia, Pasadena, Arcadia, and the other San Gabriel Valley cities listed above. Call (626) 357-3535 to confirm that we service your address.
Speak to Our Experts for More on How Heat Pumps Work in Monrovia and the San Gabriel Valley
A heat pump moves heat instead of creating it, which is why one outdoor unit can handle both cooling and most of the heating in a mild climate like Monrovia and the San Gabriel Valley. If you want the local service conversation for a specific house – installation, repair, or a maintenance plan – call (626) 357-3535. We can help you make the call for your family.