How do you choose a heat pump for a Washington, DC property?

Choose your heat pump by its heating output at 14°F, ENERGY STAR’s design temperature for Washington, matched against a room-by-room heat loss; then settle ducts, circuits, permits and rebates before you compare prices. Our typical range for a whole-home ducted system is $8,000 to $18,000 before rebates. At Perennial DC Heat Pumps we install ducted air-source heat pumps across Washington, DC, and this guide follows each decision in order.

What do you have now, and what’s wrong with it?

What heats your house today decides the kind of project before we pick any model. A gas furnace with central air means you already have ducts and the job is a conversion. An older heat pump means a replacement. A boiler and radiators means there’s no air distribution at all. A condo unit may have its own split system, a water-source unit on a building loop, or a share of central plant.

Each of those is a different job with a different price and a different DCSEU tier. A gas-to-heat-pump conversion with an ENERGY STAR ducted system currently carries a $4,000 rebate; an electric-to-heat-pump replacement carries $1,000. So your starting system shapes the budget from day one.

Gather what you can read safely: the outdoor unit’s nameplate, the furnace or air handler label you can see without removing panels, the thermostat model, and old invoices. Our survey-preparation article lists what helps us most. In a shared building, find out who can approve changes to exterior walls, roofs and electrical feeders before anyone orders equipment.

Tell us what’s changing in the house. A finished basement, a converted attic, new windows or an insulation project all change the heat loss at 14°F. When you describe the house as it will be after work you’ve committed to, we size for the right home. The old equipment’s size is no substitute.

Tell us what you want, too. Replacing a failed system, getting off gas, cooling an upstairs that never cools, and adding air conditioning to a house that never had it are different goals. Our project assessment tool organizes those facts without picking a size. A short list works: system type, rooms served, model numbers, who owns what, and why you’re doing this now.

How does a heat pump keep you warm in a DC winter?

An air-source heat pump moves heat rather than making it. In heating mode the refrigerant pulls heat from outdoor air at the outdoor coil, the compressor raises its pressure and temperature, and the indoor coil releases that heat into your house. A reversing valve flips the flow in summer so the same system cools.

Because it moves heat, a heat pump gives you more heat than the electricity it uses. That ratio, the coefficient of performance (COP), falls as the air gets colder because the compressor has to lift heat across a wider gap. Electric resistance heat has a COP of 1: each kWh becomes 3,412 Btu and no more.

Capacity drops with temperature too. A system’s heating output at the 47°F rating point is usually the biggest number on its spec sheet, and output at 14°F can be noticeably lower. That’s why we size from the 14°F figure in the manufacturer’s extended tables. Our cold-climate service page covers models built to hold more output when it’s cold.

You’ll see two efficiency ratings on every quote. SEER2 is seasonal cooling efficiency and HSPF2 is seasonal heating efficiency, both under federal test procedures. Higher is better, but neither tells you capacity at 14°F or predicts your bill. ENERGY STAR and ENERGY STAR Most Efficient labels set your DCSEU rebate tier, and the matched pair must appear on one AHRI certificate.

The compressor type shapes comfort. A single-stage unit runs flat out or off. A two-stage unit has a high and a low setting. A variable-speed unit adjusts across a range, which suits DC’s long spring and fall and its muggy summers, though it still has a minimum output below which it cycles.

Newer systems also use different refrigerants. Most heat pumps installed before the federal transition run on R-410A; current residential systems use A2L refrigerants such as R-454B or R-32. Our refrigerant guide explains why that makes a full matched replacement the norm rather than swapping one part.

Here’s what we do and don’t do. Our services directory covers ducted air-source installation, replacement, conversion, dual fuel, air handlers and ductwork. Ground-source systems, heat pump water heaters, ductless mini splits and shared commercial loops are separate trades, and our $8,000 to $18,000 range doesn’t apply to them.

Can your ducts carry what a heat pump needs?

Your ducts carry the heat pump’s output to the rooms, and they often hold it back. A heat pump usually moves more air than a furnace for the same heat because its supply air is cooler, so returns sized for a furnace can choke airflow and cut capacity. We check supply branches, return paths, filter size and room loads together.

Our ductwork service separates targeted fixes, such as an added return, sealing or a resized branch, from wider rebuilding. A new outdoor unit won’t fix a crushed flex duct or a disconnected branch. In a rowhouse, the top floor often needs more air than its size suggests, because it loses heat through the roof in winter and soaks it up in summer.

If your house has no ducts, it needs new runs through closets, chases, attics or soffits, with restoration afterward. We price that from the site visit and put it in your written estimate, separate from our typical range. Our ducted-versus-ductless guide explains the difference and why we don’t do ductless work.

We set the boundary of the job in writing. A replacement swaps a matched pair. A furnace conversion removes gas heat and usually adds 240-volt circuits. An air-handler-only job needs its own compatibility check. Each estimate lists the rooms, equipment and supporting work included.

Disruption is part of the job. A new return through a finished wall improves airflow but means opening and patching; keeping your existing ducts saves the finishes but keeps a known limit. Either can be right, and our estimate tells you which trade-off you’re choosing.

Is the system sized for your coldest rooms?

We run a load calculation, in the style of ACCA Manual J, that estimates each room’s heat loss at ENERGY STAR’s DC heating design temperature of 14°F and heat gain at its cooling design temperature of 94°F. It takes in walls, insulation, windows, orientation, air leakage and occupancy. A neat-looking report built on wrong window or insulation inputs is still wrong, so we measure.

Then we compare your heat loss at 14°F with the matched system’s output at 14°F. A worked example with made-up numbers: a house loses 30,000 Btu/h at 14°F; a system lists 36,000 Btu/h at 47°F but 26,000 at 14°F. The 4,000 Btu/h gap at design has to come from backup or from a model with more low-temperature output. Our sizing guide explains the balance point this creates.

Cooling gets its own check. In a heating-driven climate, equipment sized for the 14°F load can be bigger than the summer load needs, which shortens cooling cycles and pulls out less moisture. Variable-speed equipment and correct airflow narrow that gap, as our humidity guide explains.

Compare proposals at the same conditions. One model’s 47°F output beside another’s 17°F output tells you nothing. Ask each for the heat loss at 14°F, the heat gain at 94°F and the system’s output at 14°F, with exact model numbers rather than a series name; our estimates show all of them.

Backup is part of the design. Electric resistance strips turn each kWh into 3,412 Btu; a 10 kW strip delivers about 34,000 Btu/h and draws about 42 amps at 240 volts. A dual-fuel system keeps a furnace for the coldest hours instead. We state the backup size and the outdoor temperatures at which it’s allowed to run.

Each backup choice has a consequence. A small strip heater keeps electrical work down but leaves less margin near 14°F; a bigger strip covers the gap but may push your service toward a heavy-up; a kept furnace avoids that load but keeps gas service and usually gives up the DCSEU conversion tier. We explain our choice in your estimate.

Where does everything go, and is there enough power?

The supporting work often decides whether an equipment choice is practical. The indoor air handler needs a way in and service access afterward. The outdoor unit needs the manufacturer’s clearances, a short enough line route and a firm base. In a rowhouse, the back yard may be reachable only through the house; in a managed building, roof access may need a crane date and management approval.

Power is two questions. Branch circuits must match each unit’s nameplate. Your service must have room for the new load, which only a load calculation, using the National Electrical Code method, can show. An empty breaker slot isn’t spare capacity. Our electrical guide covers the DOB permits: $22 for an instant general electrical permit and $64.90 for a heavy-up.

DCSEU also pays toward electrical work that supports a heat pump: up to $2,000 for a heavy-up to 200 amps and $400 per new circuit, up to three circuits. Those amounts come back after installation, so the electrical work is still paid for in the contract.

Refrigerant lines and drainage need clear decisions. We reuse a line set only if its size suits the new equipment and it passes a pressure test; otherwise we replace it, which can mean opening finished ceilings. Condensate needs a trapped, sloped drain and overflow protection. Outdoors, defrost meltwater has to drain away from walkways, and with the National Weather Service putting DC’s average seasonal snowfall at about 13.8 inches, we set stand height by site and manufacturer instructions.

Our estimate assigns each related item: major ducts, electrical service, structural supports, roof work and finish repair. A short sketch with equipment positions, the line route and who handles what can expose an access conflict before it turns into a change order on site.

Which permits, approvals and rebates apply to you?

Every heat pump installation or replacement in DC needs a DC Department of Buildings mechanical or refrigeration permit, and we line it up before work starts. The listed fees are $50.60 for an instant mechanical permit up to 10 tons or a Class E refrigeration permit up to 120,000 Btu/h. New circuits or a service upgrade add electrical permits. These are fees only, not the whole approval path.

Where you live can add reviews. In a historic district or on a landmark, exterior equipment changes go through Historic Preservation Office review; in Georgetown, exterior changes visible from public space also go to the Commission of Fine Arts under the Old Georgetown Act. Our historic-property guide covers placement. Many DC front yards between the property line and the sidewalk are public space, so equipment there needs a DDOT public space permit.

In a condo, the association’s approval is separate from any government permit and from whether the system suits the unit. One doesn’t replace the others.

DCSEU’s current residential rebates for an ENERGY STAR ducted heat pump are $1,000 when it replaces electric heat and $4,000 when it replaces gas, or $1,500 and $5,000 for ENERGY STAR Most Efficient. Eligible properties are DC residential buildings with up to four units, plus individual condo and co-op units in larger buildings. Our DC rebate guide has the full table.

DCSEU’s application rules call for a DC-licensed contractor and a DC Master Refrigeration and Air Conditioning mechanic, the DOB mechanical permit, the AHRI certificate, a paid itemized invoice, model and serial numbers, the distributor invoice and, for conversions, proof the fuel system was removed. DCSEU asks for submission within 30 days of installation. If you keep your furnace in a dual-fuel setup, we don’t count on the conversion tier.

If your household is income-qualified, you can apply through DOEE’s affordable home electrification programs, which carry the federal HEAR and HOMES funding in DC. The federal 25C home improvement credit ended for property placed in service after December 31, 2025, so it doesn’t apply to a new installation.

Insurance is a separate question. Your homeowner’s policy may or may not cover equipment replacement after damage. If a claim is involved, get your insurer’s decision in writing before you count on it.

How do you compare quotes fairly?

Compare scope first. List the current and proposed systems, exact models and AHRI certificate, heat loss and output at 14°F, backup size, duct work, electrical lines, placement, permits, removal and restoration. A cheaper quote can be the right choice when its limits are clear; a low total that leaves out a heavy-up or a return upgrade is a different project.

Our typical range for a whole-home ducted installation or like-for-like replacement, with standard materials and access, is $8,000 to $18,000 before rebates. The written estimate after the site visit sets your price. Major duct rebuilding, service upgrades, difficult or roof access, structural work and historic-review complications sit outside that range; we price them from the visit. Our cost guide breaks down what moves a job within the range, and our cost estimator keeps extra work on separate lines.

Labor is a large share of that price. BLS data for May 2025 show HVAC mechanics and installers in the Washington metro earning a mean $35.45 an hour, about 14% above the national $31.14. A wage isn’t a billing rate, which also carries insurance, licensing, vehicles and overhead.

We agree startup with you before work begins: a nitrogen pressure test, evacuation to the manufacturer’s micron level, charge verification, measured airflow, and a test of each control mode. If a heating mode can’t be tested in summer, we set the follow-up. Our quote checklist lays these out line by line.

Keep warranty, payment and schedule terms tied to the contract. If a quote includes a running-cost projection, ask for its kWh, therm, COP and rate inputs separately from the installation price.

Here’s how two quotes can differ. One keeps your existing ducts with measured airflow inside the equipment’s range; the other adds a return to fix a measured restriction. The equipment may be identical, and the totals differ by the cost of the return. Ask for the airflow measurement behind each choice.

What happens after it’s installed?

Keep the model and serial numbers, AHRI certificate, refrigerant type and charge, startup readings, permits, manuals and warranty documents together; we hand them over at the end of the job. Get the DCSEU application in within 30 days. Learn which thermostat settings are yours and which we set at installation; our controls guide explains why a generic smart thermostat may not run every stage of a variable-speed system.

In the first season, log comfort by room, time, outdoor temperature and thermostat mode, and change one setting at a time. Our first-week article gives a format. A record of when auxiliary heat runs is especially useful: long stretches of backup on mild days point to a capacity, airflow or control problem rather than normal defrost.

Get to know normal defrost and auxiliary behavior: short cycles that melt frost in damp weather near freezing, sometimes with a plume of vapor. For energy use, our running-cost guide prices kWh with the OPC calculator components, about $15.40 per 100 kWh before riders and taxes, and our heat pump versus furnace guide shows the break-even COP against gas.

Routine care follows the manual: keep the filter clean, keep leaves and snow off the outdoor coil, and keep the condensate drain open. When you’re ready, request an estimate with your current system, property type, any approvals you know about and what you want fixed. You don’t need to know the equipment size first; that’s our job.