A good installation starts with the house and ends with a checked, working system.
The visible equipment is only one part of the job. Before the system is installed, the contractor should know the home's heating and cooling loads, the exact equipment combination, how air or refrigerant will be distributed, what happens to the existing furnace or air handler, and whether the electrical and control system can support the proposed configuration.
After the equipment is set, the project is not finished until airflow, controls, refrigerant circuit, condensate handling and operating modes have been checked and the homeowner understands what the system should do in normal heating, cooling, defrost and backup-heat operation.
If two installation quotes contain different equipment, duct work, electrical work, backup heat or commissioning, they are not the same project even if both are labeled “heat pump installation.”
- Design
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Load and equipment come first.
Manual J establishes the residential heating and cooling loads; Manual S uses those loads, local design conditions and manufacturer performance data to select equipment.
- Design
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Distribution is part of the design.
Ducted systems need an airflow and duct plan; ductless systems still need room-by-room indoor-unit placement and capacity decisions.
- Build
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The quote should name the physical scope.
Indoor and outdoor equipment, lines, drains, electrical work, controls, pads or brackets, removal, access work and any duct changes should be visible.
- Build
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Retained equipment must be intentional.
If a furnace, air handler, ducts or controls stay, the proposal should explain how the new heat pump works with them.
- Verify
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Startup is not just turning the thermostat on.
The installed system should be checked against manufacturer requirements and the intended design before the crew leaves.
- Verify
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The homeowner needs the operating plan.
Normal runtime, backup heat, filters, thermostat modes and service documentation should not be left ambiguous.
Before comparing quotes, check what each installer is actually proposing.
One contractor may be quoting a simple equipment swap while another is proposing duct, electrical, control or backup-heat changes. Write down what each proposal includes so you can see why the prices and recommendations differ.
- Project type
Replacement, first heat pump, addition or renovation?
A straight replacement, a furnace-to-heat-pump conversion, a new ductless addition and a whole-home renovation can all use heat pumps but require different work.
- Current system
What is installed now, and what is supposed to remain?
Write down the exact furnace, air handler, AC or heat pump model when you can. Keeping a furnace or indoor unit changes what must be compatible, how the controls work and what the installer needs to include.
- DUCTS
Ask whether your existing ducts can provide the airflow the new heat pump needs.
Ask whether the existing supply and return system can deliver the airflow the selected equipment needs and whether known leakage, static-pressure or room-balance issues are being addressed.
- Electrical
Know whether the project needs new electrical work.
The proposal should identify required circuits, disconnects and any panel or service work rather than treating them as an undefined later add-on.
- Heating plan
Define what happens on cold days.
If the project retains a furnace, adds electric auxiliary heat or uses another backup source, the equipment, controls and intended operating logic belong in the plan before installation.
A useful quote separates equipment from the work required to make it function as a system.
- Load basis
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Current heating and cooling loads
Ask what residential load calculation supports the selected capacity instead of accepting square-foot rules or inherited tonnage as the only basis.
- Equipment
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Exact indoor and outdoor models
The proposal should identify the selected combination clearly enough to verify performance and matching.
- Indoor side
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Air handler, coil, furnace or indoor heads
State what is new, what is retained and how the indoor equipment fits the heat-pump configuration.
- Refrigerant
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Line-set and refrigerant-circuit scope
New or reused lines, routing, access and manufacturer requirements should be explicit rather than implied by “standard install.”
- Condensate
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Drainage and moisture handling
Identify condensate routing, pumps where applicable and any access or finish work needed to complete the drain path.
- Electrical
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Circuits, disconnects and panel or service work
Separate electrical work from the equipment price so exclusions and add-ons are visible.
- Controls
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Thermostat, communicating controls and backup-heat logic
The thermostat and controls must work with the exact heat pump, indoor equipment and backup-heat setup. Do not treat a thermostat swap as a generic afterthought.
- Removal
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Old equipment, fuel equipment and disposal
State what is removed, what remains in service and whether gas, oil or other fuel infrastructure is altered or left in place.
- Permits
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Local permits and required inspections
Permit and inspection requirements vary by jurisdiction, so the quote should identify who is responsible for them.
- Handoff
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Startup, commissioning and homeowner documentation
The project should end with a verified operating system and a clear record of models, settings, warranties and maintenance expectations.
New equipment does not fix a weak distribution system by itself.
For a ducted heat pump, the ducts are part of the equipment-selection problem. ACCA Manual D is the residential duct-design standard used with Manual J and Manual S. It addresses supply and return sizing, duct geometry, fittings, pressure and airflow distribution.
An existing duct system can sometimes remain, but that should follow evaluation rather than assumption. A home with weak returns, high static pressure, significant leakage or persistent room imbalance can carry those problems into a brand-new heat pump.
If a quote says “use existing ducts,” ask what was checked. The useful answer is not merely that conditioned air currently comes out of the registers; it is whether the distribution system can support the airflow and room loads of the selected equipment.
If the ducts stay, the quote should still state what testing, sealing, balancing or modifications are included and what known limitations remain.
Make electrical and control work visible before installation day.
Heat-pump projects can require dedicated electrical work for the outdoor unit, indoor equipment, auxiliary heat or controls. The exact requirement depends on the selected equipment and the existing electrical system, so this page does not provide breaker, conductor or terminal-by-terminal instructions.
Ask what electrical work is required, who will do it, whether panel or service work is included, and what would be billed as extra. Those items should be clear before installation is scheduled.
Controls matter most when the project includes retained equipment, dual fuel, auxiliary heat or communicating components. The quote should explain how the exact heat pump, indoor equipment and backup heat will be controlled rather than relying on generic thermostat language.
The last step is proving that the installed system operates as intended.
ACCA's HVAC Quality Installation framework treats design and installation as one quality process. Before the crew leaves, ask for the startup results and records showing that the selected equipment was installed, configured and checked against the project requirements rather than simply powered on.
The exact startup checks vary by equipment. Ask whether airflow, controls, refrigerant-system setup, condensate handling and operating modes were checked according to the applicable manufacturer and project requirements.
For split systems, AHRI certification applies to the exact indoor-and-outdoor combination, not just the outdoor cabinet. Ask for the model numbers and the AHRI Certified Reference Number or certificate when applicable so the installed combination can be verified.
- Operating check
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Heating and cooling respond correctly.
The system should demonstrate normal modes rather than leaving the homeowner to discover basic configuration problems after the crew leaves.
- Operating check
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Backup heat is understood.
If auxiliary or fuel backup exists, the homeowner should know its role and how the controls are intended to use it.
- Airflow
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Distribution matches the project design.
Persistent hot, cold or low-airflow rooms should not be treated as a normal consequence of installing new equipment.
- Airflow
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Filters and service access are clear.
The homeowner should know where filters are, what routine maintenance is expected and how service access works.
- Documents
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Keep the exact equipment record.
Model numbers, AHRI reference information, warranties, permits and startup documents are useful for future service and incentives.
- Documents
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Know who owns follow-up.
The quote or contract should make clear how installation issues and callbacks are handled.
Compare installation quotes on scope before you compare totals.
Two proposals with the same nominal capacity can still describe materially different projects. Check these items in each quote before comparing totals.
- Load
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What current Manual J loads are being used?
Square footage or old tonnage alone is not a complete sizing basis.
- Selection
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What Manual S or equivalent equipment-selection basis is documented?
Look for exact models and performance at local design conditions.
- Matching
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Is the indoor/outdoor combination verifiable?
Ask for exact model pairing and AHRI certification information when applicable.
- Distribution
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What happens to ducts, room units and airflow?
Keep duct modifications, sealing, balancing and indoor-unit locations visible.
- Electrical
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What is included and what is excluded?
Circuits, disconnects, panel work and electrical subcontracting should not be hidden in later allowances.
- Backup
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What is the cold-weather heating plan?
Document auxiliary heat, retained furnace or other backup source, controls and intended operating logic.
- Commissioning
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What startup and verification work is included?
Ask what measurements or checks will be completed before the job is signed off.
- Exclusions
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What can become an add-on?
Permits, access work, finish repair, electrical changes, duct repair and condensate routing are common scope boundaries worth clarifying in advance.
Common heat pump installation questions.
How long does a heat pump installation take?
There is no useful universal duration. A narrow equipment replacement, a ductless multi-room project, a ducted redesign and a project that needs electrical or duct work have different schedules. Ask the contractor to separate site work, equipment installation, inspections and commissioning in the project plan.
Can a contractor size the new system from the old unit?
The old equipment can provide context, but replacement sizing should use current residential loads and equipment-selection data. ACCA Manual J and Manual S are the standard references for those steps.
Can I reuse my existing ducts?
Possibly, but reuse should follow airflow and distribution evaluation. Existing ducts may still need sealing, balancing, return changes or other modifications to support the selected equipment.
Do I need to replace my furnace too?
Not automatically. If the project keeps a furnace for dual fuel or backup, verify equipment compatibility, controls, condition and the intended operating plan. If the project removes the furnace, make the replacement heating path explicit.
Should the installer give me an AHRI certificate?
For applicable split systems, an AHRI Certified Reference Number or certificate is useful evidence of the exact matched indoor/outdoor combination and its certified ratings. It can also matter for some incentive programs.