Heat Pumps for Manufactured and Mobile Homes: The Rules and Programs That Apply

By Max Fisher · Published 2026-10-22 · Updated 2026-10-24

Short answer. A manufactured home is built in a factory to a single federal standard, the HUD Code, instead of to your county’s building code. That changes how the home is inspected and installed, and it can change which programs and paperwork apply, but it does not change the physics of heating or who may legally do the work. A heat pump can serve a manufactured home well. Heat pump installers still need to measure the home’s actual heat loss, and every Maryland license rule still applies.

The HUD Code, briefly

The U.S. Department of Housing and Urban Development’s Office of Manufactured Housing Programs enforces the federal Manufactured Home Construction and Safety Standards, known as the HUD Code, under the National Manufactured Housing Construction and Safety Standards Act of 1974. HUD marked the HUD Code’s 50th anniversary in September 2026.

According to HUD, the office:

Enforces the construction and safety standards and the installation standards, directly and through state agencies.
Inspects factories and retailer lots.
Authorizes a certification label for each section of a compliant home. That label is how you know a home was built to the HUD Code.
Runs a dispute resolution program among manufacturers, retailers and installers, and gives homeowners recourse through State Administrative Agencies and HUD.

Installation is a separate layer. HUD’s Manufactured Home Installation Program, set up in 2008, makes sure every state has minimum installation standards. States may adopt their own standards as long as they meet or exceed the federal installation standards in 24 CFR Part 3285. Each new home comes with manufacturer installation instructions approved for that purpose. So the home’s construction is federal, while how it is set, anchored and connected can involve state and local requirements. Your county permit office can tell you what applies to added equipment, electrical work or structural changes.

Federal energy standards: not in effect

You may read that manufactured homes now have federal energy efficiency standards. The DOE did publish standards in May 2022. But on its manufactured housing page, the DOE now says those standards have no legal effect. It cites the ROAD Act, which says no federal energy efficiency standard for manufactured homes takes effect until HUD adopts one through its consensus process. HUD had not adopted such standards, so the DOE published a notification of no legal effect in the Federal Register on September 18, 2026, and says it will not enforce its standards.

In practice, the insulation and duct quality of a manufactured home depend on when and how it was built, not on a current federal energy rule. That is one more reason to measure rather than assume.

Why the home itself matters for a heat pump

Manufactured homes often differ from site-built houses in ways that affect heating:

Envelope. Older homes in particular may have thinner insulation in the walls, floor and roof. Belly insulation under the floor can sag or be damaged.
Ducts. Ducts often run through the floor cavity or underbelly. Leaks there lose heat to the outdoors before it reaches a room.
Mechanical space. Furnace closets can be compact, which limits indoor equipment choices.

None of these rule out a heat pump. They change the order of work and the size of the system. A blower door test and a duct check tell you whether sealing, belly repair or duct repair should come first. See is your home ready.

Ducted or ductless

ENERGY STAR notes that a ducted heat pump can use a home’s existing forced-air ducts, and that homes where ducts are a problem can use ductless mini-split heat pumps instead, mounted on a wall or ceiling with an outdoor unit. In a manufactured home with leaky or damaged belly ducts, ductless is often worth pricing. It is still a choice to make after an assessment, not an automatic answer. If the ducts are sound or repairable, a ducted system may cost less. The basics of both types are in how heat pumps work.

A sensible order of work

For most manufactured homes, the same sequence that works in a site-built house applies, with a few home-specific checks:

Find the HUD label and data plate. They identify when and where the home was built, which helps an assessor and an installer know what to expect.
Get an assessment. A blower door test, a look at the belly and a duct leakage check show where heat is going.
Fix the envelope and ducts first. Sealing, belly repair and duct repair often cost less than oversizing the equipment to make up for them.
Size the heat pump for the home after that work, from a load calculation, not from the old furnace’s label.
Plan the outdoor unit and electrical work with your county’s requirements and, if you lease your lot, the community’s rules.

Doing it in this order means you buy the smallest system that keeps the home comfortable, and any program that pays for weatherization does so before you pay for equipment.

Programs to check, and what we could confirm

Program	What we found	What to confirm
Maryland Weatherization Assistance Program (WAP)	DHCD’s WAP page lists Standard Work Specifications for “Single Family Homes and Manufactured Homes,” and serves both homeowners and renters	Your income eligibility and what work the local agency will do on your home; see the WAP section in Pillar 5
EmPOWER Maryland utility programs	MEA describes audits, weatherization and efficient equipment incentives through your electric utility	Whether your utility’s program has any terms specific to manufactured homes, on its own program page; see the rebate stack
County permits	Not something we can answer statewide	Whether electrical work, a new outdoor pad or structural changes need a local permit

We are not stating that every program treats manufactured homes exactly like site-built houses. Program documents are not always explicit, so confirm directly with the program before you count on it.

If you rent your lot

Many manufactured homes sit on leased land. Before you add an outdoor unit, a concrete pad or a new electrical circuit, check your lease and the community’s rules on exterior equipment and placement. WAP serves renters too, but the work may need the owner’s permission.

Licensing still applies

Home type does not change who may do the work. In Maryland, anyone installing or servicing heating and cooling equipment needs a license from the State Board of HVACR Contractors, and the company you sign with needs an MHIC license for home improvement work. Technicians handling refrigerant need EPA Section 608 certification. Installation and setup of the home itself is a separate trade from HVAC work. See contractor licensing for how to check each one.

What to ask an installer

“Have you installed heat pumps in manufactured homes before, and can you give a reference?”
“Will you test the ducts and the belly before quoting, or quote from the old furnace size?”
“Ducted or ductless for this home, and why?”
“Where will the outdoor unit sit, and does it need a pad, a stand or a permit here?”
“Will the electrical service support the system, or does it need upgrading?”

How to verify this yourself

HUD: Office of Manufactured Housing Programs
DOE: Manufactured Housing and its 2026 notification
DHCD: Weatherization Assistance Program

Tell us if a source changes. To find installers near you, including companies that list ductless mini-splits, see the ductless mini-splits service page or start with your city on the DMV directory.