Heat pump installation / Great Falls & Cascade County
Understand what stays, what changes, and how the finished system will heat your home when temperatures fall. Compare equipment, electrical work, winter placement, and backup controls in one written scope.
Call 406-781-4027 for an estimate and availability. An online inquiry does not reserve an appointment.
Our approach / The whole installation
A heat pump quote should explain more than the new unit. What stays? What needs replacing? How will the house stay warm when it gets cold? You should know what the work involves and how to use the finished system.
A Great Falls homeowner called after their 15-year-old AC failed during a July heat wave, leaving upstairs bedrooms above 80°F. They wanted quiet, reliable cooling and an option to reduce spring and fall gas use while keeping their six-year-old gas furnace.
Our airflow checks supported the proposed 3-ton system, but we found corroded refrigerant piping and a sunken outdoor pad. We recommended a variable-speed heat pump with a compatible indoor coil, retaining the furnace for cold-weather backup.
The installation included new refrigerant lines, a raised equipment base, updated drainage, and coordinated dual-fuel controls. At startup, we recorded a 19°F temperature drop across the indoor coil and demonstrated the thermostat settings to the homeowner. Heating-season savings will need follow-up; the initial measurements documented cooling performance.
Replacing cooling? Compare standard AC installation scope →
A heat pump can be selected to cover different portions of a home’s heating demand. Before choosing equipment, decide how much heating it needs to provide. Then compare the home’s heating and cooling needs with what the model can deliver in cold weather. An advertised low operating temperature does not tell you how much heat a particular model will deliver to your home.
Manual J calculates building loads; Manual S guides equipment selection using performance data. Ductwork, blower capability, cooling performance, and indoor distribution also need assessment. The old AC’s tonnage or your home’s floor area alone won’t tell you which equipment to choose.
Background: PNNL cold-climate sizing and selection; ACCA residential design manuals.
These starting points need different scopes. Compare the complete work and intended coverage.
A central dual-fuel retrofit combines a heat pump with furnace backup. Establish the approved indoor/outdoor combination, blower and coil compatibility, duct airflow, controls, electrical work, and the existing furnace’s condition before deciding what stays.
Compare the complete equipment combination and installation scope. A simultaneous changeout can make sense, but age alone does not decide the answer, and new components do not automatically make a system communicating or rebate-eligible.
An addition, a home without ducts, or a separate workspace may call for a room-by-room plan. Indoor-unit placement, closed-door coverage, drainage, line routing, electrical supply, and cold-weather output determine the scope.
Plan ductless room coverage, indoor-unit placement, and routing →
An all-electric installation is another option to assess where appropriate. Its heat delivery, electrical requirements, and any supplemental heating need their own plan. See the hub’s system comparison for the broader choices.
The selected equipment’s requirements and the home’s existing electrical loads determine the assessment. Keeping gas or propane backup may avoid electric resistance backup loads, but you still need to check the available electrical capacity. Empty breaker spaces are not a load calculation.
The estimate should identify circuit, disconnect, panel, or service work if needed, the responsible trade, and any coordination or inspection requirements. Ask for those items before comparing installation totals.
Technical background: DOE Building Science Education: electrical-panel assessment.
A central dual-fuel example
The controls coordinate the heat pump and furnace according to the approved equipment arrangement.
Respond to heating demand using the selected capacity, fuel-cost, and operating-limit settings.
Supplies heat within the selected operating plan.
Supplies backup heat when the control strategy calls for it.
A compatible coil, blower, and duct system deliver heat to the rooms served.
Conceptual control plan, not a piping or wiring diagram. Changeover settings and permitted operation are equipment-specific; no fixed outdoor temperature applies to every home.
The capacity balance point concerns heat-pump output versus house demand. The economic balance point compares heating costs. Equipment operating limits are a separate consideration. The selected control arrangement needs to account for these factors using manufacturer-approved operation.
Ask when backup is expected to operate, how the controls coordinate the heat sources, and which settings the homeowner should use. Great Falls does not have one universal switchover temperature. Avoid changing lockouts or service settings without guidance for the equipment.
Sizing and backup context: PNNL cold-climate heat-pump selection guidance.
The site assessment should address expected snow and drifting, roof runoff, defrost drainage, required airflow clearances, service access, noise, and vibration. Stand height, wall brackets, wind protection, and base-pan provisions depend on the model and location.
Keep meltwater away from walkways where it could refreeze. Discuss where snow will be moved and whether the equipment will remain accessible. A fixed riser height does not resolve every site’s winter conditions.
Installation reference: PNNL ductless heat-pump installation guidance.
Use the actual scope to compare estimates. Equipment price, installation work, operating assumptions, and incentives are separate parts of that decision.
On smaller screens, scroll the checklist sideways.
| Scope item | What to confirm |
|---|---|
| Purpose, loads, and selection | Rooms served, heating/cooling load assumptions, exact equipment, cold-weather capacity, and any limits to coverage. |
| Equipment kept or replaced | Existing furnace or air handler, indoor coil, blower, ducts, controls, and refrigerant piping; compatibility and required changes. |
| Electrical work | Equipment requirements and household load assessment; circuits, disconnects, panel/service work if needed, and the responsible trade. |
| Winter location and support | Manufacturer clearances, expected snow/drifting, roof runoff, defrost drainage, service access, noise/vibration, and appropriate support. |
| Heating controls and backup | Approved control arrangement, capacity and fuel-cost assumptions, operating limits, and an explanation of when backup is used. |
| Piping, permits, and startup | Approved joining and line reuse/replacement, testing and charge procedures, permit/inspection responsibility, operating checks, and any follow-up test. |
| Price, documentation, and handoff | Included work and exclusions, equipment records, warranty/registration responsibilities, owner instructions, and incentive paperwork requirements. |
Ask how the selected equipment will be installed and checked under its manufacturer’s requirements: approved refrigerant piping and joining methods, pressure/leak testing, evacuation and verification, charge adjustment, airflow, controls, and operating checks. The project plan should identify permits and inspection responsibilities for the address.
Know the actual refrigerant and required safety provisions. EPA’s 2026 inventory exception permits continued installation of qualifying higher-GWP residential and light-commercial equipment manufactured or imported before January 1, 2025. The year alone won’t tell you which refrigerant a proposed system uses. Detection or mitigation requirements depend on the equipment and application.
When the work is complete, request equipment records, relevant startup results, thermostat and backup instructions, filter and owner-care guidance, and the actual warranty and registration responsibilities. If weather prevents a required check, the plan should name the follow-up. Confirm timing for your project rather than assuming a one-day installation.
Official references: EPA’s 2026 inventory rule; Great Falls code adoption; Montana mechanical permit jurisdiction.
NorthWestern’s 2026–2027 electric existing-home application lists $450 for qualifying ducted or ductless heat pumps. The equipment requirement is ENERGY STAR rated or SEER2 ≥ 15.2 and HSPF2 ≥ 8.5. The account, existing-home, timing, documentation, and funding conditions still apply; a gas-only account doesn’t qualify you for this rebate.
Sun River Electric’s separate air-source program requires approval before installation. Confirm the utility serving the property, current application, exact equipment, and required paperwork before ordering. Keep the full project price visible while eligibility is verified.
Before counting a rebate: Rebate amounts, eligibility rules, deadlines, and funding may change, be suspended, or end without notice to Great Falls Heating and Air LLC and without our knowledge. Published offers do not guarantee availability, eligibility, approval, or payment. Before buying equipment or authorizing work, confirm current terms, funding, and any required advance approval directly with the program administrator. Review verified program details →
Sources reviewed October 30, 2026: NorthWestern electric existing-home application; Sun River air-source heat-pump program.
Review program dates, conditions, and rebate paperwork →Before approving installation
Start with a heating and cooling load calculation for your home, not a square-footage chart or the old unit’s tonnage. The installer should compare that demand with the exact model’s output at local winter design conditions and its ability to run at lower output in mild weather. A larger unit can create cycling or comfort problems if its minimum output is too high for the load. Ask which rooms the design covers and how any cold-weather heating shortfall will be handled.
The panel rating alone cannot answer that. Have a qualified professional assess the selected equipment, other household loads, existing service and circuits, and any electric backup heat. Keeping a gas or propane furnace may avoid resistance-heater loads, but it does not prove the existing electrical supply is adequate. Before approving the job, confirm which circuits, disconnects, panel or service changes are needed, who will do that work, and whether it is included in the price.
Sources: DOE Building Science Education: electrical panel assessment
A suitable furnace may stay if the proposed indoor coil, blower, heat pump, airflow, and controls work together. Ask the quote to identify the exact equipment combination and the condition of the furnace being retained. The backup plan should account for heat-pump capacity, your home’s demand, fuel costs, and manufacturer operating requirements; there is no universal Great Falls changeover temperature. At handoff, ask how normal and backup operation were checked and which settings you should use.
Sources: Carrier: dual-fuel controls and changeover; PNNL: capacity and supplemental-heat planning
Choose the location and support for the actual equipment and site, following the manufacturer’s instructions. Account for snow and drifting, roof runoff, defrost drainage, required airflow and service clearances, and noise or vibration near bedrooms. A fixed stand height does not suit every property, and meltwater should not be directed where it can freeze across a walkway. Have the quote show the proposed location, mounting method, line route, and drainage plan before work begins.
Compare the exact equipment and all the work needed to serve the same rooms: indoor units or coil, ducts, electrical work, piping, drainage, outdoor support, backup heat, controls, removal, and applicable permits. Ask for exclusions, startup checks, warranty and registration responsibilities, and the process for approving extra work in writing. Online cost guides are budgeting references, not a quote, advertised rate, or price cap from Great Falls Heating and Air; your actual cost may be lower or substantially higher. Confirm any rebate separately with the utility serving your address before counting it toward the price.
Confirm the job’s schedule and expected heating, cooling, and electrical interruptions before work begins. Access, equipment delivery, duct or electrical changes, permits, inspections, and weather can affect completion, so do not assume every installation takes one day. Ask for startup records covering the checks required for your equipment, including airflow, refrigerant setup, controls, and backup operation where applicable. If conditions prevent a required test, get the remaining check and follow-up plan in writing, along with owner instructions and warranty responsibilities.
Sources: Carrier: installation timing and startup; ENERGY STAR: quality installation checks
Your next step
Discuss your existing system, electrical needs, winter location, and heating priorities. Call for an estimate and current availability.
