A good heat pump decision ties your house, the equipment and the installation together. At Perennial DC Heat Pumps we install and replace ducted heat pumps across Washington, DC, and we wrote these guides to explain the choices behind a ducted project here, from room loads and electrical capacity to permissions and ownership. They help you put together a clear brief for us without diagnosing equipment or picking a size yourself.
Heat pump costs
Our typical range for a whole-home ducted air-source installation or like-for-like replacement in DC is $8,000 to $18,000 before rebates. The written estimate after our site visit sets your price. Major duct work, electrical service changes and hard access sit outside that range, and we price them from the visit. We install ducted heat pumps across DC and put every part of the job in writing.
The range covers one whole-home ducted air-source system in a house: equipment, installation labor, standard materials and normal access. Not every project lands inside it, which is why our estimate itemizes the ordinary connections and who files which permit instead of hiding them behind the word “standard”.
Read the complete heat pump costs page
DC heat pump buying guide
To choose a heat pump for a DC home, we start with the system you have, work out what the house needs and then compare complete equipment-and-installation packages. Ducts, electrical capacity, placement and permissions get settled before any model or rebate drives the decision. We install ducted air-source heat pumps across DC, and this guide follows the steps that turn an interest in heat pumps into a plan that works.
We begin with the building, not a product ranking. What heats each room, what cools it and is the equipment yours alone? A furnace pushes warm air through ducts; a boiler or radiators move heat a different way. A condo’s indoor unit may connect to its own outdoor unit, a shared water loop or another building system. Each of those is a different job.
Read the complete dc heat pump buying guide page
Heat pump sizing
We size a DC heat pump from your home’s heating and cooling loads, then check the exact equipment’s output at the outdoor temperatures that matter here. Floor area and the old unit’s tonnage aren’t enough. We install ducted heat pumps across DC and size the equipment and the ducts together.
A load calculation shows how much heating and cooling the house needs at stated design conditions. It uses the walls and roof, insulation, windows, which way the house faces, air leakage and how rooms are used. It’s only as good as those inputs: a detailed-looking report can still mislead if it assumes the wrong windows or leaves out an addition, so we measure the house we’re sizing.
Read the complete heat pump sizing page
Electrical requirements
Every heat pump job needs the circuits checked for the specific equipment and a look at how much electrical capacity the house has to spare. The outdoor unit, the indoor unit and any electric backup heat can each need something different. We plan the electrical side of every ducted heat pump installation in DC before our estimate treats an existing connection as reusable.
We start from the proposed equipment pair and the backup heat. The manufacturer’s documents set the electrical needs; you can’t read them reliably from the old system or the nominal size. Electric backup heat can add a big load, so we size it with the heating design instead of adding it as an unexplained extra.
Read the complete electrical requirements page
Historic homes
If your house may be in a DC historic district, we check the address, its designation and what changes outside before we commit to where the unit goes. Review can cover visibility, supports and line routes as well as the unit itself. We install ducted heat pumps in historic DC homes and build those limits into the plan from the start.
A neighborhood name doesn’t tell you whether a given house is designated, contributing or subject to a particular review. We confirm the address against official DC historic-property records. An outdoor unit already on the property doesn’t prove a different size, support or line route will be treated the same way.
Read the complete historic homes page
DC rowhouses
In a DC rowhouse, the top floor is often the room that never feels right, and the fix ties the room loads to how air climbs the house and where equipment can go. The outdoor unit is only part of it. We install ducted heat pumps in DC rowhouses, where returns, stairs, rear access and past renovations shape the job.
We start with how each room is heated and cooled now. A rowhouse may have forced air, radiators, separate cooling or a mix left by renovations. Its shape doesn’t prove it has usable ducts, so we note which equipment serves which rooms before we talk about a whole-home replacement.
Read the complete dc rowhouses page
Condo heat pumps
Replacing a condo heat pump means the new equipment has to fit, and you need the right to change it and what it connects to. The indoor unit being inside your home doesn’t prove the whole system is yours. We install ducted air-source heat pumps in DC condos, and we identify any shared building system before we scope a replacement.
We start with your condo documents, the management’s information and any equipment records you have. We identify the indoor unit, the outdoor equipment, the electrical supply and any shared piping or controls. Ownership and maintenance duties can differ, so a part you usually service may still connect to common equipment the association has to approve changes to.
Read the complete condo heat pumps page
Running costs
What a heat pump costs to run depends on how much heating and cooling the house needs, how the equipment performs, your energy rates and how often backup heat runs. The installed price is a separate question. We install ducted heat pumps across DC, and when we compare running costs we show the assumptions instead of promising a flat percentage saving.
The installation price covers the equipment and the agreed work. Running cost is the energy used day to day plus any fixed monthly charges. A cheaper installation doesn’t mean cheaper bills, and an efficient model can’t promise a particular bill without knowing the house and how you run it. We use your own bills for the comparison.
Read the complete running costs page
DC rebates
Before you count a rebate in your budget, check the current DC program, your property type, the exact equipment and the program’s installer requirements. A product label alone doesn’t win approval. We install ducted heat pumps in DC, and this guide explains what to settle first; nobody can promise an award or that an application will be accepted.
Start with who runs the program and whether your property is actually in the District. DC programs don’t cover a Maryland or Virginia address, even one a block from the line. A program for a single home can also differ from one for a commercial property or a shared building system.
Read the complete dc rebates page
Defrost and auxiliary heat
Steam from the outdoor unit or an “aux heat” message on the thermostat usually worries people, but neither proves a fault. Defrost clears frost from the outdoor coil; auxiliary heat adds heat when the design or controls call for it. We install ducted heat pumps across DC, and our replacement estimate explains how your system should behave in winter and how the backup is set up.
When an air-source heat pump heats the house, its outdoor coil pulls heat from the outside air. On cold, damp days moisture can freeze on that coil. Defrost briefly changes how the system runs to clear the ice so it can keep heating. The details depend on the equipment and its controls.
Read the complete defrost and auxiliary heat page
Thermostat compatibility
We choose heat pump controls from what the full equipment pair needs, backup heat included. A smart thermostat you like won’t automatically run every feature. We install ducted heat pumps across DC and name the controls in our estimate alongside the indoor and outdoor models, rather than picking them after the equipment arrives.
A thermostat can do more than switch heat on and off. Depending on the system, it may call for stages, manage backup heat, read the outdoor temperature or talk to variable-speed equipment. What it has to do depends on the manufacturer-approved pairing and the design we’ve planned.
Read the complete thermostat compatibility page
Humidity control
If the house feels clammy even when the thermostat says it’s cool, we look at humidity alongside temperature, airflow and where the moisture comes from. Turning the thermostat down or buying a bigger unit isn’t a universal fix. We install ducted heat pumps across DC and design the cooling to handle both heat and moisture in your actual house.
Cooling a room and drying it are related but separate jobs. Sensible cooling lowers the air temperature; latent cooling removes moisture when water condenses on the indoor coil and drains away. How much you need varies with the weather, the people at home, air leakage and other moisture sources, so a temperature reading alone doesn’t tell you how comfortable you’ll be.
Read the complete humidity control page
Quote checklist
A heat pump estimate should name the full equipment pair, how it was sized, the supporting work and who is responsible for what. Compare those before you compare totals. We install ducted heat pumps across DC, and our written estimate separates what’s included from assumptions, exclusions and anything still to be settled.
Note the current system and what the project changes. Is it a matched heat-pump replacement, a furnace conversion or an indoor-unit job? The estimate should say which equipment stays and which comes out. The exact indoor and outdoor models matter more than a series name.
Read the complete quote checklist page
Refrigerant compatibility
Refrigerant decides which equipment works together, whether the line set can stay and how the system has to be installed. You can’t swap it freely between systems. We handle ducted heat pump replacement across DC, and our estimate names the refrigerant and the approved equipment pairing, then explains what we can keep and what has to change.
Use the equipment label you can see, the model paperwork or old service records to find the refrigerant your current system uses. Don’t open the equipment or try to sample it. The replacement we propose names its own refrigerant and the parts designed for it.
Read the complete refrigerant compatibility page
Heat pump versus furnace
Deciding between a heat pump and keeping the furnace comes down to what your house needs, the full installed job and your real energy costs. No answer fits every DC home. We install ducted heat pumps across DC and help you decide whether all-electric, a heat pump with fuel backup or another option fits your house and goals.
A furnace makes heat from its fuel and pushes it through ducts. An air-source heat pump moves heat between outdoors and indoors, so it cools as well as heats. Switching to a heat pump changes both the equipment and how the whole house is heated and cooled.
Read the complete heat pump versus furnace page
Ducted versus ductless
Ducted and ductless heat pumps differ mainly in how they get conditioned air into your rooms. Both use air-source technology, but the distribution, the indoor equipment and what a retrofit involves are different. We install ducted heat pumps in DC; this comparison helps you see which kind of project you have, and we don’t install ductless mini splits.
A ducted system uses an indoor air handler and ducts to supply rooms and bring air back. A ductless system uses indoor units that each serve a space, piped to outdoor equipment. The real difference is how air moves through the house, not whether the box outside is called a heat pump.