The Project: 1962 Colonial in Newtown Township
Last fall, we completed an oil-to-heat pump conversion for the Morrison family in Newtown Township that illustrates both the potential and challenges of switching from oil heat. Their 2,400 square foot colonial was built in 1962 with a Weil-McLain cast iron boiler and baseboard hot water heat.
After 25 years in the HVAC business, I can tell you that these conversions aren't as straightforward as the marketing materials suggest. This project took three weeks start to finish, cost more than initially estimated, and required solutions that most contractors don't discuss upfront.
But the results speak for themselves: the Morrisons cut their heating costs by 60% and gained central air conditioning they never had before.
Why They Decided to Switch
The decision came down to three factors: rising oil prices, an aging boiler that needed $2,800 in repairs, and their teenage daughter's asthma that worsened during winter months without air conditioning to filter air.
Heating oil cost them $3,200 during the 2025-26 winter. Their Buderus G115WS boiler was 22 years old with a cracked heat exchanger section and failing zone valves. Oil delivery companies in Bucks County were quoting $3.89 per gallon for the upcoming season.
They considered a new oil boiler ($8,500 installed) but realized they'd still face rising fuel costs and would need a separate AC system for comfort and air quality.
System Design Challenges in This Home
Converting from hydronic baseboard heat to forced air requires adding ductwork throughout the house. This 1960s colonial had some advantages - full basement, standard 8-foot ceilings, and accessible joist bays. But it also had complications typical of homes from this era.
Ductwork Design and Installation
We designed a trunk and branch duct system using the main basement beam for the supply trunk. Six supply runs serve the main floor: two for the living room, one each for kitchen, dining room, and two bedrooms. Upstairs required four supplies for three bedrooms and a bathroom.
Return air was more challenging. The original layout had doorways but no central hallway suitable for a large return grille. We installed two return air ducts: one in the main hallway and another in the family room, connected by transfer grilles above bedroom doors.
Total ductwork installation took five days and cost $4,800. This included insulating all ducts in unconditioned spaces and sealing with mastic compound. We used galvanized steel for main trunks and insulated flex duct for branch runs.
Electrical Service Upgrade
The home had 100-amp electrical service adequate for general use but insufficient for a large heat pump system. We coordinated with Hartman Electric to upgrade to 200-amp service before installing the heat pump.
The electrical upgrade cost $2,100 and included new main panel, meter socket, and 240V circuit for the outdoor unit. PECO required inspection before connecting new service, which delayed the project by three days.
Equipment Selection and Sizing
Proper sizing was critical because heat pumps lose capacity as outdoor temperature drops. We completed a detailed Manual J load calculation considering the home's specific construction, insulation levels, and window types.
Heat Pump System Specifications
We installed a Mitsubishi PUZ-HA36NHA7 cold climate heat pump with matching air handler. This 3-ton unit provides heating capacity down to -13°F outdoor temperature, suitable for Bucks County's climate.
The system includes backup electric resistance heat strips for extreme cold days, though they're rarely needed with Mitsubishi's hyper-heating technology. Variable speed operation adjusts capacity based on actual heating and cooling demand.
Total equipment cost was $7,200 for the outdoor unit, indoor air handler, and backup heat strips. This is 40% higher than standard heat pumps but necessary for reliable heating in our climate.
Hot Water Solution
Removing the oil boiler meant finding a new hot water source. We installed a Navien NPE-240A2 tankless gas water heater to replace the indirect water heater connected to the old boiler.
The gas line required upgrading from 3/4 inch to 1 inch to supply adequate flow for the tankless unit. Total hot water solution cost $3,400 including gas line modifications and venting.
Installation Process and Timeline
Week One: Preparation and Electrical
We started by coordinating with the oil company to properly abandon the underground storage tank. Tank removal isn't required but the fill and vent pipes must be capped below grade. The oil company pumped out remaining fuel and disconnected supply lines.
Electrical upgrade happened simultaneously. The utility company required 48-hour notice for service disconnection during panel replacement. We scheduled this for a Tuesday to avoid weekend emergency rates.
Week Two: Ductwork Installation
Ductwork installation was the most disruptive phase. We cut openings for supply registers in main floor walls and ceiling-mounted returns. Each opening required patching and touch-up painting.
The biggest challenge was running ducts to the master bedroom located over the garage. We had to route ductwork through an exterior wall chase and insulate heavily to prevent condensation issues.
Week Three: Equipment Installation and Startup
Heat pump installation started with positioning the outdoor unit on a concrete pad. We located it on the north side of the house away from bedrooms to minimize noise concerns.
Refrigerant lines run through the basement and up through an interior wall to minimize exposure to weather. We used armaflex insulation on both liquid and suction lines to prevent condensation and energy loss.
Initial startup included checking refrigerant charge, airflow measurement, and programming the thermostat. We spent two hours with the homeowners explaining system operation and maintenance requirements.
Real Performance and Operating Costs
The system has been operating for six months now, providing data on actual performance versus projected savings.
Heating Season Performance (November 2025 - March 2026)
Electric usage for heating averaged 1,850 kWh per month during the coldest months. With PECO's residential rate of $0.12 per kWh, monthly heating costs ranged from $185 in mild months to $280 during February's cold snap.
Compare this to oil heating costs of $420-650 per month the previous winter. The heat pump maintained 68°F throughout the house compared to hot and cold spots with the old baseboard system.
The backup electric heat strips operated only eight hours total during the entire heating season, confirming that the Mitsubishi hyper-heating technology works as advertised in our climate.
Cooling Season Benefits
The Morrisons now have central air conditioning for the first time. Previous summers required window units costing $180+ monthly to cool just bedrooms and the family room.
Central air conditioning provides whole-house comfort, better humidity control, and improved air quality through proper filtration. Their daughter's asthma symptoms decreased significantly with consistent temperature and filtered air.
Total Project Investment
Complete Cost Breakdown
Heat pump equipment and installation: $11,200. Ductwork design and installation: $4,800. Electrical service upgrade: $2,100. Tankless water heater installation: $3,400. Permits and inspections: $450.
Total project cost: $22,950. This was $3,200 higher than our initial estimate due to complications with the electrical upgrade and additional ductwork needed for proper air distribution.
Federal tax credits reduced net cost by $2,000 for the heat pump and $300 for the tankless water heater. PECO rebated an additional $500, bringing net investment to $20,150.
Payback Calculation
Annual energy savings total approximately $1,800 compared to oil heating and window AC units. Simple payback period is 11.2 years, but this doesn't account for avoided oil boiler replacement costs or rising fuel prices.
Factor in the $8,500 they would have spent on a new oil boiler, and effective payback drops to 6.5 years. Rising oil prices and stable electricity rates improve the economics over time.
Challenges and Lessons Learned
What We'd Do Differently
The electrical upgrade should have been completed first to avoid project delays. We now survey electrical panels during initial consultations and recommend upgrades before starting HVAC work.
Ductwork design needed more return air capacity. We added a second return register after initial startup when we measured inadequate airflow. Proper design would have caught this upfront.
Communication with homeowners about project timeline was insufficient. Three weeks of construction disruption with contractors working in finished basement space required better coordination and expectations management.
Ongoing Maintenance Requirements
Heat pumps require more maintenance than oil boilers but less than window AC units. We service the system twice yearly: spring tune-up for cooling season and fall preparation for heating mode.
Filter replacement every 60-90 days costs $15-25 for quality pleated filters. The Morrisons chose washable filters to reduce ongoing costs. Annual maintenance contracts cost $195 and include priority service scheduling.
Would They Do It Again?
Absolutely. Mrs. Morrison says the comfort improvement alone justified the investment. Consistent temperatures throughout the house, better air quality, and elimination of oil deliveries improved their quality of life significantly.
The financial benefits took longer to materialize than expected, but rising oil prices vindicated their decision. Oil peaked at $4.12 per gallon this past winter while electricity rates remained stable.
Most importantly, they're insulated from future oil price volatility and supply disruptions. The February 2026 supply shortage that left some neighbors without heat for three days didn't affect them.
Considering a similar conversion for your Bucks County home? Call (215) 379-2800 to discuss your specific situation and get realistic cost estimates for your property.