# How do heat pumps in DC historic homes get through review?

> Heat pumps in DC historic homes: we place equipment so HPO's 1 to 3 day minor-work review applies, follow roof screening rules and plan for Georgetown's board.

URL: https://perennialdcheatpumps.com/guide/heat-pumps-historic-homes/

Keep the outdoor unit, line set and any roof equipment out of view from a public street, and review is usually quick. DOB forwards your permit to the Historic Preservation Office, which treats hidden HVAC equipment as minor work and typically answers in 1 to 3 days. Visible placement is what slows a project down. At [Perennial DC Heat Pumps](https://perennialdcheatpumps.com/) we plan ducted systems around that route from the first visit.

## Will your heat pump permit go to historic review?

Yes, if the house is a landmark or inside a historic district. Every new or replacement heat pump in DC needs a [DOB](https://dob.dc.gov/page/get-permit) mechanical permit, and we line it up before work starts. When the address is a landmark or sits in a historic district, DOB forwards the application to HPO before issuing it. The equipment is the same; what changes is a second reviewer looking at the outside of the house.

HPO publishes [three review tiers](https://planning.dc.gov/node/917422). “HVAC equipment and solar panels” placed where they are clearly not visible from a street count as minor and routine work, usually cleared within 1 to 3 days of HPO receiving the file. Roof work that needs a site visit or mock-up to prove it’s hidden goes to staff review, typically about 5 days. Visible or larger changes can go to the Historic Preservation Review Board, which puts the project on a board meeting agenda instead of a staff desk. A window air conditioner isn’t reviewed at all.

That is why we let placement set the calendar. A condenser on a rear pad behind a [Capitol Hill rowhouse](https://perennialdcheatpumps.com/service-areas/capitol-hill/) can clear in days, while the same unit on a front porch roof can add weeks of back-and-forth. Our [rowhouse guide](https://perennialdcheatpumps.com/guide/heat-pumps-rowhouses/) covers the rear-yard, roof and alley choices in detail.

## Can the condenser go on the roof?

It can, if it sits where the street can’t see it. The District’s [roof guidelines](https://planning.dc.gov/sites/default/files/dc/sites/op/publication/attachments/DC%20Roof%20Guidelines.pdf) are direct: HVAC equipment “should be located so that it is not visible from a public street.” If that can’t be done, the equipment should be screened, and the screen itself has to suit the building’s proportion, scale, materials and color. New mechanical penthouses should sit as far behind the main facade as possible.

On a flat rowhouse roof, setback is the lever. A condenser toward the rear parapet usually drops out of the sightline from the opposite sidewalk, while one near the front cornice doesn’t. We design screens carefully for a mechanical reason too: a heat pump moves a lot of air across its coil, and a tight enclosure lets discharge air loop back to the intake, cutting capacity in both heating and cooling. Manufacturer clearances still set how close any screen can sit. Roof placement also adds structural support, curbs and flashing, which we price from the site visit on top of the typical range on our [cost page](https://perennialdcheatpumps.com/heat-pump-cost/).

## Is your house actually in a historic district?

Look up the address, not the neighborhood name. HPO lists about 70 historic districts. Among the neighborhood districts are Anacostia, Bloomingdale, Capitol Hill, Cleveland Park, Dupont Circle, Foggy Bottom, Georgetown, Kalorama Triangle, Kingman Park, LeDroit Park, Logan Circle, Massachusetts Avenue, Mount Pleasant, Shaw, Sixteenth Street, Strivers’ Section, Takoma Park (the DC district, not the Maryland city), U Street and Woodley Park.

Those are district names, and the boundaries rarely match what residents call their area. Part of a block can be inside while the next street is out, and a house with a familiar neighborhood name may sit outside any district. We check the parcel on the [DC historic district map](https://planning.dc.gov/page/dc-historic-districts) before planning around a review. Our area pages for [Dupont Circle, Logan Circle and Shaw](https://perennialdcheatpumps.com/service-areas/dupont-logan-shaw-dc/) and [Cleveland Park and Woodley Park](https://perennialdcheatpumps.com/service-areas/cleveland-park/) explain how several overlapping districts affect those streets, and the [service-area directory](https://perennialdcheatpumps.com/service-areas/) lists the rest.

## Living in Georgetown? The Old Georgetown Board looks too

Georgetown runs on a separate law. Under the Old Georgetown Act of 1950, the District must refer permit plans in Georgetown to the U.S. Commission of Fine Arts, and its Old Georgetown Board reviews them. CFA’s [own guidance](https://www.cfa.gov/project-review/old-georgetown/old-georgetown-faqs) names mechanical equipment such as vents, meters and rooftop condensers as items that need the board’s review, and a permit can’t issue without final CFA action.

Two details catch people out. The board reviews every alteration visible from public space, which includes rear walls seen from an alley. Its staff visits the site to judge visibility, and vegetation doesn’t count as screening, so a condenser hidden by a hedge in summer is treated as visible. The Commission of Fine Arts says submission deadlines to DOB fall three weeks before the board’s monthly meeting, which is usually the first Thursday of the month. Work the board finds not visible returns to the District’s preservation review. For a house in [Georgetown or Burleith](https://perennialdcheatpumps.com/service-areas/georgetown/), we settle placement and screening before we choose equipment.

## Where do the outdoor unit and the copper lines go?

Usually the rear yard. A ground pad behind the house, set back from the side lot lines, keeps the unit out of street views and makes service easy. DC’s noise rule caps air-conditioning and heat pump equipment at 60 dB(A) at the property line under 20 DCMR § 2801.2, so in a narrow rear yard we lean toward a quieter outdoor unit or a spot farther from the neighbor’s fence, comparing the rated sound level with that distance before we commit.

We plan the refrigerant lines, condensate and wiring as carefully as the cabinet. Copper lines strapped up a front or side wall are visible exterior work; lines carried inside an interior chase, a closet stack or the rear wall are not. Each hole in a historic wall is permanent, so we route through the least visible one. Ground units also need room to shed defrost meltwater. DC averages about 13.8 inches of snow a season (NWS), and our [cold-climate service](https://perennialdcheatpumps.com/cold-climate-heat-pumps/) explains how stand height and drainage follow the manufacturer’s instructions for the site.

## Does your front yard belong to the city?

Often, yes. DDOT’s definition of public space often includes the front and side yards between the sidewalk and the building, known as “public parking,” even when they look like private gardens. DC rules bar structures on a parking without the District’s authorization, so if a condenser is planned for your front yard, we settle the public-space question with [DDOT](https://ddot.dc.gov/page/application-forms-and-requirements-public-space-usage) first. In a historic district the front is also the most visible spot, which makes it the hardest placement to get approved.

## Permit fees and what to have ready for our visit

The DOB fees themselves are small: a Class E refrigeration permit for 0 to 120,000 BTU/h is $50.60 including the surcharge, and an instant general electrical permit is $22. The real cost of historic review is in drawings, photos, redesign and calendar time, not fees. DCSEU rebates also require the DOB permit, so skipping review puts the incentive at risk as well; our [rebate guide](https://perennialdcheatpumps.com/guide/dc-heat-pump-rebates/) lists the current tiers.

Before our survey, gather the address and any district record, photos of the rear and roof taken from the street and alley, earlier approval letters, and the electrical panel details covered in the [electrical requirements guide](https://perennialdcheatpumps.com/guide/heat-pump-electrical-requirements/). The [survey-preparation article](https://perennialdcheatpumps.com/blog/preparing-for-a-heat-pump-survey/) organizes the rest, and the [quote checklist](https://perennialdcheatpumps.com/guide/heat-pump-quote-checklist/) shows how to ask who prepares the review submissions. We still size from a room-by-room load checked at ENERGY STAR’s 14°F DC heating design temperature, as the [sizing guide](https://perennialdcheatpumps.com/guide/heat-pump-sizing/) explains. [Request an estimate](https://perennialdcheatpumps.com/contact/) with your address so we plan placement against the right review route from the start.

## Questions before you decide

### Does an old house automatically require historic approval?

No. Review follows designation, not age. HPO reviews work on designated landmarks and on properties inside one of DC's roughly 70 historic districts, and district boundaries often split a neighborhood, so a 1910 rowhouse a block outside the line goes through an ordinary DOB permit. We check your address on DC's historic district map before planning around a review.

### Can a rear-yard location still need review?

Yes. In most districts a rear condenser that can't be seen from a street usually falls in HPO's minor-work tier, typically answered in 1 to 3 days, but it is still reviewed. In Georgetown the Old Georgetown Board looks at anything visible from public space, rear alleys included, and vegetation doesn't count as screening.

### Should equipment be ordered before placement is resolved?

Not if the location could change. A board that asks for a different position or a screen can change the line length, the pad or bracket and sometimes the cabinet size that fits. We settle the location with HPO, or with the Old Georgetown Board in Georgetown, then order equipment matched to that spot.

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