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Sizing a heat pump for a Baltimore home starts with the heating season, not the cooling one. Homes in Baltimore city, MD run heat about seven months a year, from October through April. A heat pump's output drops as outdoor temperatures fall, so a system that looks adequate on paper can run short on the coldest January nights. The contractor has to calculate the heat load at the low end of the local temperature range and decide where backup resistance heat or a dual-fuel setup enters the picture. An undersized unit will run continuously through those months and still leave the house short.
Ductwork laid out for a furnace-and-air-conditioner pair handles airflow differently than a heat pump needs it to. Half the homes in Baltimore city, Maryland were built in 1947 or earlier (2020-2024 ACS 5-year). That generation of ducting was sized and routed for a different kind of system, and where it falls short a contractor has to decide whether to modify, replace, or work around it before any equipment gets priced. The electrical service in houses of that vintage is a separate question on the same job. A heat pump's draw often exceeds what an older panel was sized to supply, and the answer to that shapes the full scope of what the installation costs.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner sees first, mounted on a concrete pad beside the house. Inside, an air handler sits in a mechanical closet, basement, or attic and moves conditioned air through the home. A refrigerant line set runs between the two, connecting them through an exterior wall.
A thermostat goes on an interior wall where it reads the living space and tells the system when to run. The system also includes a condensate drain line that carries moisture from the air handler to a floor drain or outside, and an electrical disconnect mounted near the outdoor unit.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Baltimore cityBaltimore City by the Numbers
67 severe weather events were recorded in Baltimore city, Maryland between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Baltimore city, Maryland were built in 1947 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesBaltimore city, Maryland holds 295,032 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 47.5% of the occupied homes in Baltimore city, Maryland (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Baltimore city, Maryland1 codes, standards, and licensing rules
Licensing and Legal Requirements in Baltimore city, Maryland
Maryland requires a state licence before an individual provides, or assists in providing, heating, ventilation, air-conditioning or refrigeration services.
Severe Weather Events in Baltimore city
Baltimore's climate puts real pressure on heating and cooling equipment year after year. How hard a heat pump works over its life is a local question, and the weather record is part of the answer.
67 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.