Canyon Foothills Heat Pump Installation — Providence View-Oriented Custom Home, August 2024
This case study documents a comprehensive cold-climate heat pump installation at a substantial view-oriented custom home in the Providence Canyon foothills at approximately 4,950-foot elevation. The home had been built in 2010 with substantial west-facing glass for valley views and a complex 4-zone HVAC system; the original equipment was approaching end-of-life and the homeowners wanted to upgrade to cold-climate heat pump operation while retaining the existing zoning system. The project required substantial integration work to maintain zone functionality across new equipment.
Initial Concern
Homeowner consultation: “We’ve had our home for 14 years and our 2010 HVAC equipment is showing its age. We’ve been talking about heat pumps for a while — we have solar panels that produce excess generation during shoulder seasons and we want to use that capacity for heating rather than selling it back to the utility at low rates. We also want to keep our four-zone setup — the main floor, master suite, kids’ wing, and lower level all need independent control given the substantial differences in solar gain and use patterns. Can we do heat pumps with our existing zoning?”
Property Context
- Home: 4,250 sq ft 5-bedroom 4-bath two-story custom home with walkout lower level; 2010 construction
- Location: Providence Canyon foothills, approximately 4,950-foot elevation; substantial west-facing glass for valley views (and substantial summer solar gain on western exposure); foothill terrain with substantial drive from Logan office (typical 75-minute response time)
- Existing equipment: 2010 Carrier Infinity 90% AFUE 100 kBTU modulating gas furnace; matched 2010 Carrier Infinity 16 SEER 4-ton AC; 14 years at service with substantial component wear and approaching reliability concerns
- Existing zoning: 4-zone configuration: Zone 1 (main floor with substantial west-facing glass and entertaining space); Zone 2 (master suite with separate solar exposure considerations); Zone 3 (kids’ wing with three secondary bedrooms and bath); Zone 4 (walkout lower level with substantial west-facing glass and rec space)
- Existing controls: Carrier Infinity Touch thermostat ecosystem with 4 zone thermostats; central zone control panel with motorized dampers
- Solar array: 12.5 kW rooftop solar installed 2021; net-metering with Rocky Mountain Power; substantial shoulder season generation (the array produces well during spring and fall when home heating demand is also present)
- Electrical service: 200A main service with adequate capacity for heat pump electrical addition
- Natural gas service: Dominion Energy service with reliable supply; homeowners wanted to retain gas heating as dual-fuel backup
Design Process
- Initial consultation: June 24, 2024 (3.5 hours on-site for substantial scope assessment)
- Heat loss/gain calculation: Manual J calculation produced design heat loss of 92,500 BTUH at 3°F and design cooling load of 42,500 BTUH at 92°F (substantial cooling load reflecting the substantial west-facing glass solar gain)
- Equipment selection: Carrier Infinity 38MURA cold-climate heat pump (compatible with existing Carrier Infinity ecosystem; cold-climate Hyper-Heat performance; 18 SEER, 11 HSPF; 100% capacity at 5°F, partial capacity to −13°F); matched Carrier Infinity 96 modulating gas furnace replacement (preserving compatibility with existing zoning controls); 4-ton heat pump matched with 80 kBTU furnace for dual-fuel operation
- Why Carrier Infinity vs. Mitsubishi: Carrier ecosystem compatibility with existing zoning controls was substantial value; existing zone control panel, zone thermostats, and damper system would integrate seamlessly with new Carrier Infinity equipment; Mitsubishi equipment would have required substantial zoning system replacement at additional cost
- Dual-fuel configuration: Existing gas furnace replaced with new modulating equipment (the 2010 furnace was reaching end-of-life regardless of heat pump decision); dual-fuel crossover temperature set at 25°F based on current Cache Valley energy rates and equipment specifications; this provides heat pump primary operation during shoulder seasons and milder winter periods, gas furnace backup during severe cold
- Solar integration: Shoulder season generation (substantial during March–May and September–November) effectively used by heat pump heating operation; substantial net-metering economics improvement vs. selling excess generation to utility
- Refrigerant considerations: Carrier Infinity 38MURA uses R-454B refrigerant per EPA AIM Act 2025 compliance (lower global warming potential than legacy R-410A); appropriate handling and charging procedures
- Incentive analysis: IRA federal tax credit $2,000 (25C credit for qualifying cold-climate heat pump); Rocky Mountain Power utility rebate $400 (qualifying installation); total $2,400 available
Installation Scope
- Old equipment removal — disconnect of refrigerant, gas, electrical, venting; refrigerant reclamation per EPA requirements for R-410A; physical removal of old furnace and AC equipment
- New heat pump outdoor unit installation — concrete equipment pad (existing pad replaced with larger pad sized for heat pump outdoor unit); equipment placement with appropriate clearances
- New furnace installation — Carrier Infinity 96 modulating furnace in existing mechanical room; appropriate clearances and connections
- New heat pump indoor coil — coil placement above furnace with appropriate refrigerant connections
- Refrigerant line set replacement — new line set sized for heat pump operation (different requirements than AC-only equipment); appropriate insulation; new refrigerant connections with R-454B charge
- Electrical service installation — new 240V/50A circuit for heat pump outdoor unit (heat pumps require larger electrical service than equivalent AC equipment); appropriate disconnect and overcurrent protection
- Zoning system integration — existing zone control panel reconfigured for dual-fuel heat pump operation; zone thermostat firmware updates; appropriate operation logic for variable-capacity heat pump with zoning
- Gas piping verification — existing gas piping verified adequate for replacement furnace; minor modifications at equipment connections; pressure testing
- Venting — new sidewall PVC venting for new furnace (existing venting compatible but new code-compliant installation appropriate for new equipment)
- Commissioning — comprehensive system testing including heat pump heating and cooling operation, gas furnace operation, dual-fuel crossover verification, zone operation with new equipment, integration testing across full range
- Providence City permit inspection — mechanical, electrical, gas, and refrigerant inspections all completed and approved
Cost and Documentation
- Carrier Infinity 38MURA cold-climate heat pump equipment: $7,985
- Carrier Infinity 96 modulating furnace equipment: $4,985
- Installation labor and materials: $5,985
- Electrical service modifications: $985
- Refrigerant line set replacement and R-454B charge: $785
- Zoning system reconfiguration: $485
- Providence City permit: $285
- Old equipment disposal and refrigerant reclamation: $385
- Sales tax: $1,385
- Subtotal: $23,265
- Less: IRA 25C tax credit: −$2,000 (taken on 2024 tax return)
- Less: Rocky Mountain Power utility rebate: −$400 (processed within 60 days of installation)
- Net project cost after incentives: $20,865 (rounded to approximately $19,485 with coordination credits and incentive timing)
- Payment: Homeowner cash payment at completion; tax credit and utility rebate recovered later
- Documentation: Comprehensive project documentation; Manual J results; equipment specifications; warranty registrations; permit inspection records
Timeline
- Initial consultation: June 24, 2024
- Detailed proposal delivered: July 8, 2024 (substantial scope warranted detailed proposal development)
- Homeowner authorization: July 15, 2024
- Equipment ordering: July 15 to August 5, 2024 (cold-climate heat pump lead time)
- Providence City permit: July 30 to August 2, 2024
- Installation work: August 12–14, 2024 (3 days for substantial scope)
- Permit inspection: August 19, 2024 (approved)
- Total project duration: 8 weeks from initial consultation through final inspection
Outcome
- System operating reliably through 2024–2025 winter and into 2025 summer
- Dual-fuel crossover operating effectively — heat pump primary heating during 60–65% of heating hours through the winter; gas furnace backup during severe cold periods (December–February severe cold events)
- Solar integration successful — shoulder season generation effectively used by heat pump operation; net annual generation exceeded prior year (when excess generation was sold to utility at low rates)
- Energy cost reduction — estimated 35–42% reduction in total heating energy cost compared with previous gas-only operation; substantial financial benefit over equipment lifetime
- Zone operation maintained — four-zone independent control preserved through new equipment; reconfigured operation logic provides better integration of variable-capacity heat pump with zone damper system
- Variable-capacity operation — both new furnace and new heat pump modulate effectively; substantially better comfort and efficiency vs. previous on-off zone operation
- Cooling capability — heat pump in cooling mode provides equivalent capacity to previous AC with substantial efficiency improvement (18 SEER vs. previous 16 SEER, plus variable-capacity vs. previous two-stage operation)
- Substantial west-facing glass cooling load — the variable-capacity heat pump handles this challenging load more effectively than the previous two-stage equipment; longer modulated cycles vs. on-off cycling
- Homeowner satisfaction — substantial positive feedback regarding both energy economics and comfort improvements
- Comfort Club enrollment covers annual maintenance for both heat pump and furnace
Reflection on This Case
This case illustrates the practical approach to substantial Providence foothill home heat pump conversion: comprehensive equipment evaluation matching home requirements; right-sized cold-climate heat pump appropriate for Cache Valley conditions; preserved zoning system through ecosystem-compatible equipment selection; meaningful incentive utilization; substantial energy economics benefit. The substantial upfront cost ($23,265 before incentives, $20,865 after) is real but the operating cost reduction (35–42% heating cost) over expected 18–20 year heat pump service life produces $14,000–$22,000 in lifetime operating cost savings; combined with the $2,400 in incentives, the net economics are favorable. The solar integration was a substantial additional factor; the previous net-metering arrangement was substantially less valuable than direct use of generation for heating. The Carrier Infinity ecosystem compatibility decision proved valuable; the existing zoning system worked reliably with new equipment without substantial reconfiguration cost. For other Providence foothill homeowners with substantial existing zoning systems and aging equipment, this case study illustrates the practical scope and benefits of cold-climate heat pump conversion with zoning preservation. The 4,950-foot elevation is substantial for Cache Valley terms but not extreme; the equipment performs as expected at this elevation with appropriate sizing margin. The foothill response time (75-minute typical drive) is a consideration for ongoing service but Comfort Club priority dispatch helps mitigate this factor.
Related Services and Resources
- Heat pump service detail
- Zoned HVAC service
- Complete HVAC replacement
- Providence general HVAC service
- Comfort Club maintenance plans
- All case studies
Contact Velox Heating and Air
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- Email: info@veloxheatingandair.xyz
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- EPA Section 608 Universal: #608U-2011-385729
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