Property: Approximately 3,600 sq ft small commercial auto service business, Broadway corridor Dracut
Owner: A.V. (small business owner alias)
Scope: Complete HVAC replacement for owner-occupied auto service business including 4-zone Mitsubishi CITY MULTI VRF configuration matching customer waiting area, office/reception, service bay office, and mechanic break room; off-hours installation scheduling to minimize business operational disruption
Timeline: Diagnostic and design 3 weeks, installation 6 days (evenings and weekend scheduled)
Investment: $34,600 installed, $7,000 Mass Save Commercial rebate, $3,500 estimated IRA 179D commercial building deduction, net $24,100
A.V. owns and operates a small auto service business (approximately 3,600 sq ft including 3 service bays and adjacent customer/office/staff space) located along the Broadway corridor (Route 28) in Dracut. Broadway is the primary north-south commercial corridor through Dracut hosting diverse small commercial development including auto services, small retail, restaurants, small professional services, and small industrial suppliers.
Property configuration: main building includes 3 service bay area (approximately 2,400 sq ft with vehicle service equipment, tools, and open bay layout typical of auto service) and adjacent customer/office/staff space (approximately 1,200 sq ft including customer waiting area with seating for 6-8 customers, reception/office for A.V. and administrative staff, service bay office for coordination between customer area and service technicians, and mechanic break room).
Existing HVAC configuration: 24-year-old gas furnace with matching central AC serving the customer/office/staff space; forced-air ductwork throughout the office space; the 3 service bays historically operated without dedicated HVAC (service bay temperature followed exterior conditions with radiant tube heaters for winter warmth — standard configuration for auto service bays). Gas water heater in mechanical room. Both gas furnace and central AC at end-of-life with declining reliability.
A.V. requested Rivic assess replacement options for the customer/office/staff space only (service bays remaining with existing radiant tube heaters). Priorities: (1) reliability improvement given recent central AC failure during a July heat wave requiring emergency service and impacting customer waiting comfort, (2) coordinated zone-level control across the four distinct-use areas (waiting area high customer occupancy, office/reception moderate occupancy, service bay office variable occupancy tied to service coordination, mechanic break room low occupancy but with cooking heat load from break room food preparation), (3) minimize business operational disruption during installation (auto service operates Monday-Saturday, so off-hours scheduling limited to evenings and Sundays), (4) reasonable capital cost with fossil-fuel elimination through heat pump conversion for Mass Save Commercial rebate.
Andrew Samples conducted the initial diagnostic assessment during a scheduled Sunday visit (A.V.’s business closed Sundays). Key findings: (1) 24-year gas furnace with declining efficiency (approximately 68-74% effective from 78% AFUE nameplate) and combustion analysis indicating heat exchanger corrosion approaching end-of-life, (2) 24-year central AC well past service life with confirmed refrigerant leak indication (approximately 25-35% below design charge), (3) existing office ductwork acceptable for heat pump conversion with minor sealing improvements, (4) 200A Eversource electric service adequate for heat pump installation with capacity margin, (5) property configuration favors 4-zone VRF over ducted retrofit given the diverse zone requirements across customer/office/staff areas, (6) service bay area intentionally excluded from scope per A.V.’s specific request (radiant tube heaters remain suitable for auto service bay operation given the frequent overhead door opening cycles and ambient exterior air exchange during service operations).
ACCA Manual J commercial load calculation determined office space cooling load at 88°F summer design of approximately 42,000 BTU/hr including internal gains from customer occupancy and office equipment, heating load at 4°F winter design of approximately 36,000 BTU/hr.
Rivic recommended Mitsubishi CITY MULTI VRF 4-zone configuration matched to office space zone configuration: (1) customer waiting area 18,000 BTU/hr concealed ceiling cassette (larger capacity addressing variable customer occupancy 6-8 patrons), (2) office/reception 12,000 BTU/hr concealed ceiling cassette (moderate occupancy consistent business hours), (3) service bay office 9,000 BTU/hr wall-mount cassette (variable occupancy tied to service coordination), (4) mechanic break room 9,000 BTU/hr wall-mount cassette (low occupancy but cooking heat load consideration). Total outdoor unit capacity 48,000 BTU/hr matched to Manual J commercial loads with margin.
Concealed ceiling cassettes selected for customer-facing areas (waiting, reception) for aesthetic consistency with typical customer service business atmosphere; wall-mount cassettes for staff-only areas (service bay office, break room) where aesthetic is less priority than functional focused airflow.
Outdoor condenser placement: rear-yard location on concrete pad adjacent to existing service bay HVAC infrastructure (radiant tube heater equipment). Refrigerant line-set routing through existing utility chase.
Gas furnace and central AC decommissioning: existing 24-year equipment removed with proper EPA Section 608 refrigerant recovery; gas piping capped at previous furnace location.
Service bay radiant tube heaters explicitly retained without modification per A.V.’s scope request.
Rivic coordinated installation scheduling with A.V. to minimize business operational disruption. Approach: (1) auto service business operates Monday-Saturday with Sundays closed; installation work scheduled during weekday evenings (6PM-10PM) and full Sundays (8AM-6PM), (2) main installation work completed over 3 Sundays and 3 weekday evenings — total 6 active installation days spread across approximately 2.5 weeks calendar time, (3) daily coordination with A.V.’s service manager confirming no unexpected Sunday appointments or evening service commitments, (4) outdoor condenser placement scheduled for Sunday morning to minimize noise disruption to Broadway corridor neighboring commercial tenants during weekday operating hours.
Installation completed with zero customer service disruption during business operating hours. A.V.’s Monday morning openings after Sunday installation activity days included brief walkthroughs with Rivic team lead to confirm any morning-of coordination requirements before customer arrival.
A brief note on service bay HVAC configuration: A.V.’s existing radiant tube heaters in the service bay area are retained without modification. Radiant tube heaters are the standard heating configuration for auto service bays because:
Heat pump conversion for service bays is technically possible but not typically recommended for standard auto service configurations. Some newer auto service configurations with better-sealed service bay envelope and specialized ventilation may favor heat pump installation; A.V.’s standard configuration continued to favor radiant tube heater retention.
Installation completed over 6 active installation days across 2.5 weeks calendar time with zero customer service disruption. Post-installation operational verification: substantially improved zone-level comfort across customer waiting area, office/reception, service bay office, and mechanic break room. A.V. reported particular satisfaction with the customer waiting area cooling improvement given the previous central AC failure during peak summer.
Post-installation first-year utility monitoring: total electric operating cost approximately $1,680 for combined heating and cooling on the office space scope. Previous year utility costs: gas heating approximately $1,540 (24-year furnace declined efficiency), electric cooling approximately $980 (declining efficiency aging AC), combined approximately $2,520/year. Annual operating cost reduction approximately $840/year. Service bay radiant tube heater operating cost unchanged (retained equipment).
Broadway corridor Dracut and Merrimack Valley small commercial HVAC service including auto service business, small retail, restaurant, and professional services HVAC installation, VRF multi-zone configuration for diverse zone requirements, off-hours installation scheduling to minimize business operational disruption, service bay vs office space scope evaluation, Mass Save Commercial rebate coordination, and IRA 179D commercial building deduction coordination all route through our 225 Broadway #306 office in downtown Methuen. This case study represents a specific installation completed for A.V.; individual small commercial property assessments determine equipment specification and installation scope.