What Maryland homes are up against.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31. · U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates
A heat pump in this state does not get to rest for long. Homes in Maryland run heat about seven months a year, from October through April. That stretch of continuous runtime accumulates wear on the compressor and the reversing valve at a pace that a marginally specified unit cannot sustain quietly. A contractor quoting a job here has to get the load calculation right, because an undersized system will be running near its ceiling for months on end, and the signs of that show up faster than most homeowners expect.
A quote for heat pump work starts with what is already in the house, and in Maryland, much of what is already there was installed before current equipment loads existed as a design consideration. Half the homes in Maryland were built in 1979 or earlier (2020-2024 ACS 5-year). That means duct sizing, insulation, and electrical service all get assessed on the job rather than assumed from an address. A contractor who skips that step is guessing at what the system will be asked to run through.
Does your part of Maryland put harder miles on HVAC equipment?
2015–2024 · Source: NOAA National Centers for Environmental Information, Storm Events Database.
A condenser sitting outside in Maryland faces wind, driving rain, ice load, and summer heat that can run for weeks. Equipment sized or positioned without accounting for local exposure gets worked harder than it was built for, and it shows in early failures and uneven performance. The licensed contractor you are matched with knows what conditions your address actually sees and sizes, places, and specs the system accordingly.
Maryland HVAC Installation and Repair License Requirements
Maryland sets its own licensing rules for HVAC installation and repair work, and the provisions below come directly from state sources rather than from a summary of them.
Maryland requires a state licence before an individual provides, or assists in providing, heating, ventilation, air-conditioning or refrigeration services.
A state license for this trade limits who is legally permitted to perform the work on your home. Unlicensed contractors are not operating within what Maryland law allows, and that matters when you are deciding who to hire. The contractors this site routes requests to hold the license these provisions describe.
View the source provisions1 provisions
Maryland requires a state licence before an individual provides, or assists in providing, heating, ventilation, air-conditioning or refrigeration services.