Pelham NH Mid-Century Subdivision Heat Pump Conversion — Case Study

Property: 1968 residential single-family, mid-century subdivision Pelham NH
Owner: G.L. (property owner alias)
Scope: Aging Liberty Utilities gas furnace and central AC replaced with mid-tier Bosch IDS 2.0 variable-capacity heat pump using existing ductwork; complete fossil-fuel elimination through Liberty Utilities gas service disconnection coordination
Timeline: Diagnostic and design 3 weeks (including Liberty Utilities disconnection coordination), installation 4 days
Investment: $22,600 installed, $2,000 NH Saves heat pump rebate, $2,000 IRA 25C federal tax credit, net $18,600

Situation

G.L. owns a 1968 residential single-family property in one of Pelham NH’s mid-century subdivision areas near Route 38 corridor. Pelham NH mid-century subdivision development includes several coordinated 1960s-70s subdivision areas near Route 38 and other primary road corridors where Liberty Utilities gas distribution infrastructure was extended during subdivision development.

The Liberty Utilities gas coverage areas in Pelham NH provide important context contrast to the rural propane retention areas covered in prior Pelham NH case studies (Beaver Lake waterfront, Little Island Pond seasonal cottage, Route 38 corridor rural propane). Pelham NH’s approximately 30-50% of properties with Liberty Utilities gas coverage are concentrated in the developed subdivision areas near primary roads; the remaining 50-70% of properties with propane retention are more consistently distributed across the town’s rural residential areas.

G.L.’s subdivision area configuration: mid-century 1960s-70s subdivision development with typical residential properties of the era — 1,800-2,400 sq ft single-family construction on 0.3-0.6 acre lots, standard 8-foot ceilings, coordinated street layout with municipal water/sewer/gas infrastructure, forced-air gas heating configurations original to subdivision development or from subsequent replacement cycles.

G.L.’s property configuration: approximately 2,100 sq ft two-story residential, forced-air Liberty Utilities gas furnace replaced approximately 18 years ago serving ducted distribution throughout, matching central AC installed with the gas furnace, gas water heater in basement mechanical space (G.L. plans coordinated future replacement with heat pump water heater for complete fossil-fuel elimination at time of future upgrade cycle).

G.L. requested Rivic assess replacement options with priorities: (1) coordinated replacement of the aging 18-year Liberty Utilities gas furnace and central AC given both approaching end-of-life range, (2) fossil-fuel elimination through heat pump conversion for NH Saves rebate opportunity, (3) Liberty Utilities gas service coordination — either complete disconnection for full fossil-fuel elimination or partial retention for retained gas water heater, (4) mid-tier equipment specification matching mid-century subdivision area market context.

Diagnostic and Assessment

Marcus Devlin conducted the initial diagnostic assessment given his gas equipment expertise relevant to Liberty Utilities coordination scope. Kathleen Brennan initiated Liberty Utilities gas service coordination in parallel.

Key findings: (1) 18-year Liberty Utilities gas furnace with declining efficiency (approximately 76-82% effective from 90% AFUE nameplate), heat exchanger inspection showed corrosion but no cracks yet, (2) 18-year central AC with typical refrigerant charge decline, (3) existing ductwork from 18-year installation scope in acceptable condition suitable for heat pump conversion, (4) 200A Eversource NH electric service adequate for heat pump installation with capacity margin, (5) Liberty Utilities gas service disconnection scope: gas water heater retained requires continued Liberty Utilities gas service (G.L. plans separate replacement in future upgrade cycle, at which point complete Liberty Utilities disconnection would apply); current installation scope maintains reduced-demand Liberty Utilities service for water heater only.

ACCA Manual J load calculation determined property heating load at 4°F winter design of approximately 48,000 BTU/hr and cooling load at 88°F summer design of approximately 34,000 BTU/hr.

Solution: Mid-Tier Bosch IDS 2.0 with Partial Liberty Utilities Coordination

Rivic recommended Bosch IDS 2.0 mid-tier variable-capacity heat pump 4-ton nominal capacity with existing ductwork utilization. Equipment specification: (1) Bosch IDS 2.0 inverter-driven variable-capacity outdoor unit, (2) Bosch matched indoor air handler with variable-speed ECM blower, (3) Bosch standard programmable thermostat, (4) 5-year Bosch parts warranty + 10-year compressor warranty.

Existing ductwork utilization: minor duct sealing improvements at accessible joints; supply and return grille inspection confirmed adequate condition from the 18-year installation scope; variable-speed ECM blower matched to Bosch IDS 2.0 variable-capacity operation.

Gas furnace decommissioning: 18-year Liberty Utilities gas furnace removed with proper procedures; gas piping capped at previous furnace location. Liberty Utilities meter and service line retained for water heater; G.L.’s future water heater replacement (planned 2-3 years out based on current water heater condition) will trigger complete Liberty Utilities service disconnection at that time.

Marcus’s MA Journeyman Gas Fitter licensure appropriate for the gas furnace decommissioning even though the property is in NH (NH does not have state gas fitter licensure requirement; MA licensure accepted for NH installations).

Pelham NH Liberty Utilities Coverage Context

Pelham NH’s Liberty Utilities gas coverage in the developed subdivision areas is a distinctive characteristic of the town’s HVAC scope that contrasts with the substantial propane retention pattern in more rural areas. Some observations across Rivic’s Pelham NH service experience:

• Liberty Utilities coverage geography: primarily concentrated in mid-century subdivision areas near Route 38 corridor, along Bridge Street corridor, and around the Pelham town center area. Gas distribution infrastructure was extended during 1960s-70s subdivision development to serve those coordinated development areas.
• Rural areas propane retention: more consistently rural areas of Pelham NH away from the developed subdivision corridors remain on propane retention as covered in prior Pelham NH case studies. Beaver Lake and Little Island Pond waterfront areas are typically propane-served; Route 38 corridor rural residential properties are typically propane-served.
• Combined pattern: approximately 30-50% of Pelham NH properties on Liberty Utilities gas coverage; approximately 50-70% on propane retention or oil retention. This ratio reflects Pelham NH’s overall rural residential character combined with pockets of developed subdivision areas with gas coverage.
• Consistent NH Saves and IRA 25C framework: heat pump conversion rebate and credit scope applies consistently regardless of prior fuel type (Liberty Utilities gas, propane, or oil).

Liberty Utilities Partial Retention Scope

Liberty Utilities partial retention coordination for G.L.’s installation follows the same protocol as the Policy Street Salem NH case study:

• Current partial service retention: Liberty Utilities service retained for gas water heater only; meter reads reduced-usage baseline reflecting water heater load only rather than combined furnace + water heater load.
• Meter and service line: existing Liberty Utilities gas meter and service line remain in operation for water heater.
• Future complete disconnection: when G.L. replaces the water heater (planned 2-3 years out) with a heat pump water heater or electric water heater, complete Liberty Utilities disconnection will apply. At that point, Liberty Utilities coordination will include meter removal, service line disconnection or capping, and account closure. Rivic can coordinate that future scope at time of water heater replacement.
• Emergency contact retention: G.L. retains Liberty Utilities gas emergency contact (855-349-5697) for any gas leak concerns while gas water heater remains in service.

Outcome

Installation completed over 4 days including outdoor Bosch IDS 2.0 placement, indoor Bosch air handler installation, ductwork sealing improvements, refrigerant charging, gas furnace decommissioning, and thermostat programming coordination with G.L. Post-installation first-year operational verification: heat pump operated reliably through the first winter including cold-snap periods with outdoor temperatures reaching 3°F to 7°F range typical of Pelham NH climate.

Ongoing Operating Cost Change

Post-installation first-year utility monitoring: total electric operating cost approximately $1,380 for combined heating and cooling. Previous year utility costs: Liberty Utilities gas heating approximately $1,240 (18-year furnace declined efficiency), electric cooling approximately $580 (18-year AC declining efficiency), combined approximately $1,820/year. Annual operating cost reduction approximately $440/year — modest reduction reflecting G.L.’s moderate property scope and the mid-tier equipment selection. Continued Liberty Utilities gas water heater operating cost approximately $260/year (reduced from previous approximately $420/year with prior delivery scheduling reflecting combined furnace + water heater load).

Investment Summary

• Total installation cost: $22,600 (Bosch IDS 2.0 4-ton equipment with matched air handler, installation labor, ductwork improvements, refrigerant charging, commissioning, Liberty Utilities partial coordination)
• NH Saves heat pump rebate: $2,000
• IRA 25C federal tax credit: $2,000
• Net investment: $18,600 after all rebates and tax credits
• Comparable MA scope hypothetical: would qualify for Mass Save Partial-Home rebate $4,000 (given water heater retention); MA net investment approximately $16,600 — NH installation is approximately $2,000 more expensive net given the partial-scope rebate framework
• Annual operating cost reduction: approximately $440/year
• Additional value: 5-year Bosch parts + 10-year compressor warranty; substantially improved reliability compared to aging 18-year equipment; foundation for future complete fossil-fuel elimination when water heater replaced

Frequently Asked Questions About This Case Study

Can Rivic install a similar heat pump conversion in my Pelham NH mid-century subdivision or other developed area property with Liberty Utilities gas coverage?

Yes for properties with suitable configuration. Prerequisites: adequate Eversource NH electric service (typical 200A minimum for mid-century subdivision construction), existing ductwork suitable for reasonable airflow at heat pump capacity, reasonable property size matched to heat pump capacity range, and Liberty Utilities gas service coordination scope for gas properties (complete disconnection for full fossil-fuel elimination or partial retention for retained gas appliances like water heater). Rivic’s diagnostic assessment includes NH regulatory framework coordination and Liberty Utilities coordination as part of installation project management. Typical cost range for Pelham NH mid-century subdivision heat pump conversions: $18,000-$32,000 gross depending on equipment tier and property size, $14,000-$28,000 net after NH Saves rebate and IRA 25C credit.

What portion of Pelham NH has Liberty Utilities gas coverage vs propane retention?

Approximately 30-50% of Pelham NH properties have Liberty Utilities gas coverage; approximately 50-70% have propane retention (with a smaller portion on oil retention as covered in the rural oil-to-heat-pump conversion case study). Liberty Utilities coverage is concentrated in developed subdivision areas near Route 38 corridor, along Bridge Street corridor, and around the Pelham town center area — where gas distribution infrastructure was extended during 1960s-70s subdivision development. Rural areas away from these primary corridors typically maintain propane or oil retention reflecting the historical lack of gas distribution infrastructure extension to more rural residential areas. This coverage pattern differs from Salem NH (higher Liberty Utilities coverage in the more developed town), Massachusetts service areas (extensive Eversource Gas of Massachusetts and National Grid coverage throughout), and reflects Pelham NH’s more consistently rural residential character.

How does Pelham NH mid-century subdivision context compare to Salem NH Policy Street subdivision context?

Similar mid-century subdivision development patterns but with some contextual differences: (1) both driven by 1960s-70s southern New Hampshire suburban expansion facilitated by I-93 highway completion and NH tax advantages; (2) both feature typical 1,800-2,400 sq ft single-family properties on 0.3-0.6 acre lots, standard 8-foot ceilings, and forced-air gas or propane heating configurations; (3) Salem NH’s Policy Street area (see Policy Street Salem NH case study) is more geographically concentrated in a substantial subdivision area with more consistent Liberty Utilities gas coverage; Pelham NH’s mid-century subdivisions are smaller pockets in a more consistently rural town with varying Liberty Utilities coverage. Rivic’s heat pump conversion scope is comparable for both contexts — same equipment specification approaches, same NH regulatory framework coordination, same NH Saves rebate framework. Individual property assessments determine specific installation scope based on property configuration.

Does partial fossil-fuel retention (keeping gas water heater while converting furnace) affect NH Saves rebate qualification?

No. NH Saves heat pump rebate typically applies to the heat pump installation itself rather than requiring complete fossil-fuel elimination on the property. G.L.’s installation qualifying scope was $2,000 based on heat pump equipment specification and installation scope; retained Liberty Utilities gas water heater did not disqualify the rebate. This matches the partial retention approach shown in the Policy Street Salem NH case study and the rural Salem NH propane conversion case study. Mass Save Whole-Home Heat Pump rebate ($10,000) does typically require complete fossil-fuel elimination for the full rebate scope; partial fossil-fuel elimination qualifies for smaller Mass Save Partial-Home rebate ($4,000). NH Saves rebate structure is less scope-dependent than Mass Save. When G.L. eventually replaces the water heater, a heat pump water heater installation would qualify for additional NH Saves heat pump water heater rebate as separate scope.

What’s the typical cost range for Pelham NH mid-century subdivision or other developed area residential heat pump installations?

Typical range: $18,000-$32,000 gross depending on equipment tier and property size. This case study’s $22,600 total reflects Bosch IDS 2.0 4-ton mid-tier configuration. Smaller property installations (3-ton systems, smaller subdivision homes) typically cost $18,000-$22,000; larger properties or premium equipment configurations can cost $26,000-$36,000. NH Saves heat pump rebate typically $1,500-$2,500 depending on qualifying scope; IRA 25C credit ($2,000) applies to qualifying heat pump installations. Liberty Utilities gas service coordination (partial retention or complete disconnection) included in Rivic’s installation project management scope at no additional charge.

Contact Rivic Heating and Air Conditioning — Pelham NH Mid-Century Subdivision Heat Pump

Pelham NH mid-century subdivision area and other Pelham NH developed area residential HVAC service including 18+ year Liberty Utilities gas furnace and central AC replacement with mid-tier or premium cold-climate variable-capacity heat pump, existing ductwork utilization with ECM blower upgrade, Liberty Utilities gas service coordination (complete disconnection for full fossil-fuel elimination or partial retention for retained gas appliances), NH Saves rebate coordination, IRA 25C federal tax credit coordination, and manufacturer warranty administration all route through our 225 Broadway #306 office in downtown Methuen. This case study represents a specific installation completed for G.L.; individual property assessments determine equipment specification and installation scope.

• Emergency Line (24/7): (351) 240-2627
• Address: 225 Broadway #306, Methuen, MA 01844
• Email: info@rivicheatingairconditioning.xyz
• Liberty Utilities (Gas — Pelham NH): 800-833-4200
• Liberty Utilities Gas Emergency (NH): 855-349-5697
• Eversource NH (Electric): 800-662-7764
• MA Refrigeration Technician License: #RT-24518
• Marcus Devlin MA Refrigeration Technician License: #RT-19842
• MA Journeyman Gas Fitter: #JGF-30521 (Marcus Devlin)
• MA Home Improvement Contractor: #HIC-191847
• EPA Section 608 Universal: #608U-2007-192874

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