Furnace Installation in Cambridge, MD
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Dorchester County will get in touch.
Tell us about the job
It takes about a minute.
Cambridge asks a new furnace to work seven months of the year
Winter nights here average 29°F, and homes need heat from October through April. That is seven months of the year your furnace has to be ready to run. A new furnace installed here has to hold up over that whole stretch, not just the coldest weeks.
More than half of homes in the area heat with electricity. Maryland saw 11% of households lose power for at least 24 hours in 2024, and the region has logged 12 winter storms and 58 damaging wind events over the past ten years. A new furnace here should be sized and installed with that in mind. If it runs on gas, federal rules set the floor. A new non-weatherized gas furnace has to reach at least 80 percent AFUE.
- 7 months
- October through April, your furnace is on duty
- 29°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Maryland requires HVAC contractors to hold a state license.
Maryland tests contractors before it licenses them, and the Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors keeps a record of who holds one. That license belongs to the contractor, not to the furnace going into your house. It says the person doing the work has met the state's standard. It does not sign off on this particular installation.
That part falls to Dorchester County. In most cities and counties, a furnace replacement needs a permit from the local building office, and the work gets inspected once it is done. The permit and inspection are what tie this specific job to a record, separate from whatever the state already knows about the contractor. One covers who is allowed to do the work. The other covers whether this furnace was installed right.
Sources: Maryland General Assembly · Maryland Department of Labor
- What size furnace does my house need?
- The right size comes from a load calculation, not from the square footage of your house alone. A contractor works out how fast your home loses heat by looking at your insulation, your windows, your ceiling height, and how much wall and window area faces outside. Two houses the same size can need different furnaces if one has more glass or less insulation. A furnace that's too big will short cycle and wear out faster, and one that's too small won't keep up on the coldest nights, so this is worth getting measured rather than guessed.
- How do I know it's time to replace my furnace?
- Watch how your furnace is running, not just its age. Uneven heat between rooms, a furnace that runs longer than it used to, or a gas or electric bill that climbs with no other explanation all point to a furnace losing ground. If a technician tells you the heat exchanger is cracked, that's not a repair, that's a replacement, since a cracked heat exchanger can let combustion gases into your air. Since homes here need heat from October through April, a furnace on its way out tends to show itself fast once the cold settles in.
- Is a high-efficiency furnace worth it?
- Every non-weatherized gas furnace built for sale today has to reach at least 80 percent AFUE, so the real choice is between that and a high-efficiency model rated higher. A high-efficiency furnace burns less gas to make the same heat, which matters here since homes in Cambridge need heat from October through April, seven months of the year, with winter nights averaging 29°F. The tradeoff is that high-efficiency furnaces vent through PVC pipe instead of a metal flue, which can affect installation depending on where your furnace sits. A contractor can walk you through what fits your house and let you weigh the difference for your own utility bills.