HVAC Replacement Cost in Baltimore, MD
Replacing an HVAC system in Baltimore looks different depending on your home. A Canton rowhouse without ductwork usually means a ductless mini-split project, while a detached home in Towson or Roland Park more often means swapping out an existing central furnace or AC. Here's what to budget for in 2026.
By Jason Green · HVAC · Published September 14, 2026 · Updated September 14, 2026 · 6 min read
Rowhouse replacement projects
Many rowhouse replacement jobs involve either replacing an aging steam or hot-water boiler or adding a ductless mini-split system for cooling since central ductwork usually isn't present. Tight basements and limited outdoor space for condensers can add complexity and cost.
Some homeowners choose to replace an old boiler with a heat pump system entirely, which changes both the scope of the electrical work and the potential BGE rebate eligibility.
Suburban central system replacement
In neighborhoods with larger detached homes like Mount Washington and Towson, replacement usually means swapping out an existing furnace and AC unit, sometimes with duct modifications if the layout has changed since the original install.
Sizing correctly for Baltimore's humid summers matters - an oversized unit can short-cycle and struggle with humidity control even if it cools the space quickly.
Permits and inspections for replacement
Full system replacement almost always requires a mechanical permit through Baltimore City's E-Permits system, and the completed work needs a final inspection before it's considered closed out.
Ask your contractor to confirm the permit has been filed and provide the permit number before installation begins, not just after the job is done.
Factoring in rebates
BGE's Smart Energy program offers rebates on qualifying high-efficiency equipment, and EmPOWER Maryland incentives can apply if you're switching from gas, oil, or propane heat to an electric heat pump.
Ask whether your contractor is a BGE participating contractor, since that can affect how easily the rebate gets applied to your final invoice.
Typical cost ranges
| Central AC replacement (3-ton, rowhouse or small home) | $4,800 - $8,500 |
| Central AC replacement (4-5 ton, larger suburban home) | $7,000 - $11,500 |
| Furnace replacement (gas, mid-efficiency) | $4,000 - $6,800 |
| Furnace replacement (high-efficiency) | $6,000 - $9,500 |
| Boiler replacement (steam or hot-water) | $7,500 - $15,000 |
| Ductless mini-split system (2-3 zones) | $6,500 - $14,000 |
| Heat pump replacement (whole system, ducted) | $6,500 - $13,500 |
| Ductwork modification during replacement | $800 - $3,500 |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
How much does it cost to replace an old boiler in Baltimore?
Steam or hot-water boiler replacement typically runs $7,500 to $15,000 depending on the boiler size, venting requirements, and whether existing radiators or piping need modification.
Is a ductless mini-split cheaper than adding ductwork?
Generally yes. Retrofitting a rowhouse with new ductwork is usually far more invasive and expensive than installing a ductless system, which is why mini-splits are so common in Baltimore's older housing stock.
Do I need a permit to replace my furnace or AC?
Yes, full equipment replacement requires a mechanical permit filed through Baltimore City's E-Permits system, followed by a final inspection.
Can I get a rebate for replacing my system?
BGE's Smart Energy program offers rebates on qualifying high-efficiency equipment, with additional EmPOWER Maryland incentives for switching to electric heat pumps from gas, oil, or propane.
How long does a full HVAC replacement take in Baltimore?
A straightforward central system swap can often be completed in one to two days, while boiler replacements or ductless installs with electrical work may take two to four days depending on complexity and permit timing.
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