Efficient Heating Upgrade for a 1953 Natick Ranch-Style Home

When a homeowner in Natick, MA, decided it was time to upgrade their aging oil-fired hydronic heating system, they turned to the trusted experts at Denommee Plumbing, HVAC & Electric. Their 1,378-square-foot ranch, built in 1953, had recently undergone weatherization improvements—making it the perfect candidate for a high-efficiency heat pump installation.

Denommee’s team delivered a seamless solution by installing a Mitsubishi 36,000 BTU Multi-Zone, Mixed-Ducted, Hyper Heat Mini Split Heat Pump system. The result? Energy-efficient comfort year-round, reliable performance in New England winters, and over $12,000 in combined incentives to offset installation costs.

Mitsubishi Hyper Heat: The Ideal Oil Replacement

Equipment Overview

The core of this upgrade was a Mitsubishi 3.0-ton Hyper Heat system, specifically engineered to maintain performance in sub-zero temperatures. The equipment installed includes:

• Outdoor Unit:

  • Model: Mitsubishi MXZ-SM36NAMHZ

  • Capacity: 36,000 BTU cooling (95°F)

  • Hyper Heat Performance:

    • 47°F: 42,000 BTU

    • 17°F: 32,400 BTU

  • SEER: 20.65

  • HSPF: 12.10

• Indoor Units:

  • MLZ-KP09NA – One-way recessed ceiling cassette

  • MLZ-KP12NA – One-way recessed ceiling cassette

  • SVZ-KP12NA – Multi-positional air handler (horizontal ducted)

• Branch Box:

  • Model: PACMKA32BC

Custom Ductwork Installation in the Attic

To support the new air handler and maximize performance, Denommee’s HVAC crew installed a custom 1.0-ton ductwork system in the attic. This was carefully designed using galvanized hard-pipe for durability and insulation integrity. Features included:

• Fully sealed seams and insulated pipes/trunks

• 3–4 supply registers and 1–2 return ducts

• Full accessory package:

  • Hangers, vibration blocks

  • Drainage with flood shutoff

  • Air filters and 3-way diffusers

The attic ductwork ensured balanced airflow, quiet operation, and high comfort across multiple rooms without disrupting the home’s interior.

Seamless Electrical Integration by Denommee’s In-House Electricians

A key advantage of working with Denommee is their fully in-house team of licensed electricians. For this project, Denommee electricians:

• Installed a new dedicated AC feed

• Installed a 2-pole breaker, high-capacity wiring, outdoor whip, and code-compliant disconnect for the outdoor condensing unit

• Handled all low-voltage wiring for HVAC controls and sensors

• Properly tagged and labeled all shutoffs for future service clarity

By offering integrated HVAC and electrical services under one roof, Denommee streamlines project coordination, reduces delays, and guarantees quality workmanship from start to finish.

Thorough Installation & Commissioning Process

Denommee’s installation approach leaves no detail overlooked. The process included:

• Setting the outdoor unit on a raised, leveled, sound-absorbing pad

• Installing line sets, insulated drainpipes, wall armor, and white line-hide casing for clean exterior aesthetics

• Nitrogen pressure testing and vacuuming refrigerant lines to under 500 microns

• Charging with R-410A refrigerant to exact manufacturer specifications

• Registering equipment for full manufacturer warranty

• Providing all operation, warranty, and maintenance documentation to the homeowner

Replacing Oil Heat: Comfort, Savings & Sustainability

This installation completely replaced the home’s aging oil-fired hydronic system. By switching to a cold-climate Mitsubishi Hyper Heat pump, the homeowner now benefits from:

• Lower annual energy costs

• Consistent comfort across seasons

• Reduced environmental impact

• Cleaner indoor air without combustion emissions

Big Savings Through Mass Save + Federal Incentives

Denommee’s team guided the homeowner through available rebate and financing options, maximizing the value of their investment:

• Mass Save Whole-Home Heat Pump Rebate: $10,000

• Federal Tax Credit (25C): $2,000

• HEAT Loan 0% Financing: Available for qualifying homeowners

Denommee is a Mass Save Heat Pump Installer Network (HPIN) contractor, meaning they can help homeowners take full advantage of these powerful incentives. Their knowledge of program requirements ensures smooth application and fast rebate approval.

Why Homeowners Trust Denommee for Heat Pump Installations

With a legacy of trusted service across eastern Massachusetts and southern New Hampshire, Denommee Plumbing, HVAC & Electric brings unmatched value to residential HVAC projects:

• Expertise in older homes: From 1920s colonials to 1950s ranches, Denommee knows how to retrofit modern systems into legacy structures

• In-house electricians: One team. One warranty. One seamless installation

• Integrated controls: Modern smart thermostats and sensors for optimal comfort and efficiency

• Rebate expertise: Helping homeowners unlock thousands in incentives

• Responsive service: Fast, transparent, and dependable every step of the way

Planning an HVAC Upgrade in Natick or Beyond?

Whether you're replacing oil, gas, or electric baseboards, Denommee’s team can design a high-efficiency heat pump solution tailored to your home and budget.

From Natick to Concord, Winchester, Billerica, and beyond, we’re the region’s trusted HVAC contractor for full-service system design, installation, electrical, and support.

Let Denommee help you make the switch to cleaner, more efficient comfort.

Call Denommee Plumbing, HVAC & Electric today or request a free consultation to explore your home’s heat pump options.