South West Methuen Triple-Decker Heat Pump Conversion — Case Study

Property: Triple-decker multi-family residential, South West Methuen, Lawrence border section
Owner: J.M. (property owner alias)
Scope: Whole-building conversion from per-apartment gas heating to per-apartment multi-zone ductless heat pump systems (3 apartments; one heat pump system per apartment)
Timeline: Diagnostic and design 4 weeks, per-apartment installation staggered over 8 weeks (2-3 weeks per apartment coordinated with tenant occupancy), Mass Save multi-unit rebate coordination throughout
Investment: $38,400 total whole-building installation, $30,000 Mass Save Whole-Home rebate scope across 3 apartments, $6,000 IRA 25C federal tax credit scope, net $2,400 after all rebates

Situation

J.M. owns a triple-decker multi-family residential property in South West Methuen along the Lawrence border. The property has three separate apartments (one per floor) with independent per-apartment gas heating configurations dating from various decades of upgrades on the property. The property is within the 2018 Columbia Gas over-pressurization event affected zone, meaning 527 CMR 5.00 amended-code documentation requirements apply to any gas equipment work.

Original per-apartment configurations: (1) first-floor apartment with 1990s-era gas furnace and standard central AC, (2) second-floor apartment with early-2000s gas furnace and split-system AC, (3) third-floor apartment with 2010s gas furnace and split-system AC. All three gas furnaces were operational but at various stages of remaining service life; all three apartments had separate ductwork and separate gas service.

J.M. is a bilingual English/Spanish-speaking property owner (Spanish preferred for detailed technical discussion) with tenants who are also primarily Spanish-speaking. Diego Ramirez handled bilingual customer coordination throughout the project including diagnostic communication, cost discussion, safety considerations, and Mass Save rebate paperwork coordination.

J.M. requested Rivic assess options for whole-building modernization considering: (1) gas heating elimination given the 2018 event history and desire to reduce ongoing gas infrastructure exposure, (2) coordinated Mass Save rebate maximization through per-apartment Whole-Home rebate qualification, (3) tenant coordination to minimize disruption during installation, (4) long-term operational reliability given J.M.’s ownership continuity plans for the property.

Diagnostic and Assessment

Marcus Devlin conducted the primary diagnostic assessment given his 2018-19 Columbia Gas relight response experience directly applicable to affected-zone properties. Marcus’s assessment across all three apartments included: (1) existing gas equipment condition assessment (adequate for continued operation but past efficiency and reliability standards new equipment would provide), (2) existing ductwork suitability for heat pump conversion (all three apartments had adequate ductwork with minor upgrades needed), (3) electric service capacity assessment per apartment (200A per apartment adequate for heat pump conversion), (4) 2018 affected-zone documentation verification (Eversource records confirmed affected-zone status).

ACCA Manual J load calculations for each apartment: (1) first floor 2,400 BTU/hr heating × approximately 22 (design temp gradient) = approximately 53,000 BTU/hr load at 4°F winter design; approximately 26,000 BTU/hr cooling at 88°F summer design, (2) second floor comparable configuration, (3) third floor slightly reduced heating and cooling loads reflecting smaller unit footprint and roof exposure considerations.

Diego Ramirez conducted bilingual (English and Spanish) diagnostic communication and cost discussion with J.M. across multiple planning meetings; Kathleen Brennan coordinated Mass Save multi-unit rebate scope preparation.

Solution: Per-Apartment Whole-Home Heat Pump Conversion

Rivic recommended per-apartment cold-climate heat pump conversion using existing ductwork (rather than multi-zone ductless configuration) given the adequate existing ductwork condition across all three apartments. Configuration: (1) first-floor apartment Bosch IDS 2.0 inverter-driven heat pump 3-ton with existing ductwork utilization, (2) second-floor apartment Bosch IDS 2.0 inverter-driven heat pump 3-ton with existing ductwork, (3) third-floor apartment Bosch IDS 2.0 inverter-driven heat pump 2.5-ton with existing ductwork.

Bosch IDS 2.0 selected for the installations given cost-effectiveness for cold-climate applications (competitive pricing compared to Mitsubishi Hyper-Heat or Carrier Infinity while providing adequate cold-climate performance for 4°F winter design), inverter-driven variable-capacity operation (efficient part-load operation matching typical apartment heating and cooling demand patterns), and Mass Save qualifying scope for per-apartment Whole-Home Heat Pump rebate.

All three per-apartment gas furnaces decommissioned and removed as part of the conversion; gas heating service disconnected from each apartment. Each apartment operates fully independent electric heat pump for both heating and cooling; no gas heating dependency remains.

Amended-Code Documentation and Marcus Devlin 2018-19 Experience

Marcus Devlin handled the amended-code documentation scope for the affected-zone property. Documentation included: combustion analysis printout retention for each removed gas furnace (10-year retention in customer file; Rivic considers this standard practice regardless of affected-zone status), manometer-verified gas pressure documentation for the removal and disconnection scope, complete venting decommissioning documentation, and coordination with Eversource Gas of Massachusetts for gas service disconnection.

Marcus’s 2018-19 relight response experience directly informed the removal and disconnection scope; the amended-code framework that emerged from the remediation is thoroughly integrated into Marcus’s standard workflow.

Mass Save Multi-Unit Rebate Coordination

Kathleen Brennan coordinated Mass Save Whole-Home Heat Pump rebate scope across all three apartments. Each apartment qualified for individual $10,000 Whole-Home rebate (total $30,000 across three apartments) given the complete fossil-fuel elimination per apartment. Additionally, each apartment qualified for $2,000 IRA 25C federal tax credit (total $6,000 across three apartments) for the qualifying heat pump installation scope.

Coordinated Mass Save application submission across all three apartments enabled simultaneous processing; rebate disbursement occurred within 60-90 days of installation completion per apartment.

Outcome

Whole-building installation completed over 8 weeks with staggered per-apartment installation to minimize tenant disruption: (1) third-floor apartment installation weeks 1-2 (tenant coordination for temporary alternate heating during 2-day transition period), (2) second-floor apartment installation weeks 3-5 (staggered to allow third-floor commissioning verification), (3) first-floor apartment installation weeks 6-8. Diego Ramirez maintained bilingual tenant communication throughout the installation schedule.

Post-installation year-one operational verification across all three apartments showed: reliable heat pump operation through the first winter including several extended cold-snap periods with outdoor temperatures reaching 0°F to 5°F range; per-apartment electric heating cost approximately $900-$1,400/year for the first year (varying by apartment size and tenant thermostat preferences); total whole-building electric heating cost approximately $3,200/year compared to previous gas heating cost approximately $4,800/year — annual operating cost reduction approximately $1,600/year. Additionally, coordinated summer cooling operating cost was approximately $600/year less than the previous separate central AC operation across all three apartments.

Investment Summary

• Total installation cost: $38,400 whole-building ($12,000-$14,000 per apartment)
• Mass Save Whole-Home Heat Pump rebate: $30,000 ($10,000 × 3 apartments)
• IRA 25C federal tax credit: $6,000 ($2,000 × 3 apartments)
• Net investment: $2,400 after all rebates and tax credits
• Annual operating cost reduction: approximately $2,200/year (combined heating + cooling)
• Simple payback: approximately 1.1 years after all rebates

Frequently Asked Questions About This Case Study

Can Rivic complete a similar triple-decker conversion on my South West Methuen property?

Yes for properties with suitable configuration. Similar triple-decker whole-building heat pump conversions require: adequate per-apartment electric service (typically 200A per apartment; some triple-deckers with older shared or under-capacity service require electrical upgrades before heat pump installation), suitable ductwork condition per apartment (or willingness to use multi-zone ductless configuration on apartments without suitable ductwork), separate per-apartment metering allowing Mass Save Whole-Home rebate qualification per apartment ($10,000 × 3 apartments = $30,000 total rebate scope), coordinated tenant scheduling for staggered installation. Rivic’s diagnostic assessment includes triple-decker feasibility evaluation as part of initial project planning.

Was Marcus Devlin’s 2018-19 experience relevant to this conversion project even though gas heating was being eliminated?

Yes. Marcus’s 2018-19 Columbia Gas relight response experience directly applies to: (1) proper decommissioning and removal of gas heating equipment on affected-zone properties, (2) amended-code documentation scope for the removal work under 527 CMR 5.00, (3) coordination with Eversource Gas of Massachusetts for gas service disconnection, (4) manometer-verified gas pressure documentation for the disconnection scope, (5) proper venting decommissioning. Marcus’s affected-zone specific knowledge streamlined the removal scope significantly compared to standard gas equipment removal on non-affected-zone properties.

Why was Bosch IDS 2.0 selected rather than Mitsubishi Hyper-Heat or Carrier Infinity?

Bosch IDS 2.0 was selected as the cost-effective cold-climate heat pump option for this specific project matching J.M.’s cost priorities and the per-apartment installation configuration. Bosch IDS 2.0 provides adequate cold-climate performance for 4°F winter design (comparable to Mitsubishi Hyper-Heat MXZ and Carrier Infinity heat pump performance at design conditions), inverter-driven variable-capacity operation, and typically 15-25% lower installation cost per apartment compared to Mitsubishi Hyper-Heat MXZ or Carrier Infinity Greenspeed. For projects where premium equipment specifications are prioritized (extended warranty scope, communicating platform integration, premium controls), Mitsubishi Hyper-Heat MXZ or Carrier Infinity Greenspeed may be preferred. Rivic recommends equipment tier based on individual property owner priorities and project economics rather than default equipment selection.

Was tenant disruption significant during the staggered 8-week installation?

Rivic minimized tenant disruption through staggered installation and per-apartment coordination. Each individual apartment had approximately 2-day transition period where heat pump commissioning occurred while previous gas heating equipment was decommissioned; during this transition period Rivic coordinated temporary alternate heating (typically supplemental electric space heaters for the specific transition day where both systems were inactive simultaneously). Tenant feedback (through Diego Ramirez bilingual coordination) indicated the staggered scheduling and clear communication about specific installation days per apartment kept disruption manageable. Alternate approaches (whole-building simultaneous installation) would have created larger disruption windows for all three tenants simultaneously.

What’s the typical cost range for triple-decker whole-building heat pump conversion in South West Methuen?

Typical range: $28,000-$48,000 whole-building depending on per-apartment configuration and equipment tier. This case study’s $38,400 total ($12,000-$14,000 per apartment) is in the middle of the typical range using cost-effective Bosch IDS 2.0 equipment with existing ductwork utilization. Multi-zone ductless configurations on apartments without suitable existing ductwork typically cost $14,000-$18,000 per apartment; premium equipment specifications (Mitsubishi Hyper-Heat MXZ, Carrier Infinity Greenspeed) typically cost $16,000-$18,000 per apartment. Mass Save Whole-Home Heat Pump rebate ($10,000 per apartment) and IRA 25C credit ($2,000 per apartment) apply consistently regardless of equipment tier where the installation qualifies for Whole-Home rebate scope.

Contact Rivic Heating and Air Conditioning — South West Methuen Triple-Decker HVAC

South West Methuen triple-decker whole-building HVAC modernization including per-apartment heat pump conversion with existing ductwork utilization, 2018 Columbia Gas affected-zone amended-code documentation and gas heating decommissioning, Diego Ramirez bilingual English/Spanish tenant coordination throughout staggered installation, and coordinated Mass Save Whole-Home rebate scope across multiple apartments all route through our 225 Broadway #306 office in downtown Methuen. This case study represents a specific installation completed for J.M.; individual property assessments determine equipment specification and installation scope.

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