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A Wolfeboro Lakes Region home added a 4-zone cold-climate heat pump system to reduce propane use while preserving a wood stove and furnace backup. The design centered on lake-effect cold, snow clearance, room-by-room zoning, and NHSaves qualified equipment documentation.
Lakes Region New Hampshire homes need cold-climate capacity checks, snow and defrost planning, backup heat strategy, and room-by-room zoning. This Wolfeboro case used a 2.5-ton Fujitsu XLTH system, four zones, propane and wood backup, and NHSaves standard rebate documentation.
| Category | Project Detail | Why It Matters |
|---|---|---|
| Home type | Lakes Region cape, 1,700 sq ft | Sets the envelope, duct, and zoning constraints. |
| Previous heating | Propane furnace and wood stove | Determines fuel-switching economics and backup strategy. |
| Equipment | Fujitsu XLTH ductless multi-zone system | Cold-climate equipment selection affects winter performance. |
| Capacity and zones | 2.5 tons, 4 zones | Shows whether the project is room-level or whole-home. |
| Rebate pathway | NHSaves standard pathway with enhanced-rebate screening where applicable | Rebate rules vary by state, utility, equipment, and project scope. |
| Cost range | $18,000-$24,000 before rebates | Useful for comparing quote reasonableness. |
| Net cost range | $17,375-$23,375 after standard rebate target | Shows cost after standard rebate target, before final approval. |
| Estimated savings | $1,000-$1,800 | Modeled operating-cost impact, not a guarantee. |
Lake-effect wind and snow exposure made outdoor placement more important than in a sheltered neighborhood.
Bedroom doors stayed closed at night, limiting heat movement from the wood stove.
The homeowner wanted heat pump savings without giving up propane and wood backup.
NHSaves documentation required qualified equipment and clear tonnage calculations.
NuWatt designed four ductless zones covering the main living area, primary bedroom, guest bedroom, and loft office.
The outdoor unit was placed away from roof-shed snow and mounted high enough for winter clearance.
Propane and wood backup were retained, with homeowner guidance on setpoints and when to use each source.
NHSaves rebate documentation included HPQPL-oriented equipment selection and AHRI capacity assumptions.
| Decision | Reason | Field Note |
|---|---|---|
| Keep wood and propane backup | The home needed resilience during outages and extreme cold. | Backup strategy should reflect how the homeowner actually lives. |
| Avoid roof-shed snow zones | Snow falling from the roof can damage or bury an outdoor unit. | NH installations need site-specific winter placement. |
| Put zones in closed-door rooms | Wood stove heat did not reach bedrooms evenly. | A comfort design accounts for doors, schedules, and occupancy. |
Cold-climate ductless sizing.
Bedrooms and living spaces separated.
Standard NHSaves pathway.
Backup retained for resilience.
Varies with wood stove use.
Compact multi-zone scope.
Snow paths, wind exposure, backup heat, and room-use patterns reviewed.
Manual J sizing, zone selection, outdoor placement, and rebate pathway.
Outdoor stand, four indoor heads, line routing, electrical, and condensate.
Setpoint strategy for heat pump, propane, and wood stove backup.
Final costs, rebates, and savings require a site-specific quote, utility confirmation, equipment selection, home energy assessment, and Mass Save approval.
Yes. The heat pump can handle steady background heating and room comfort while the wood stove provides supplemental or backup heat.
The equipment may be similar, but design temperatures, wind exposure, snow placement, and backup planning often need more attention.
NHSaves standard 2026 materials list $250 per ton for qualified heat pumps. Eligibility and funding depend on the utility and program rules.
Often, yes, especially when doors are closed at night or wood stove heat does not reach those rooms.
Only if roof snow, icicles, service clearance, and defrost drainage are handled. Many NH homes need a better protected placement.