Two heating markets share the Greater Worcester name. Inside the city, utility gas heats about 54% of households and fuel oil only about 11%, according to the Census Bureau's 2024 survey. Across Worcester County the order flips: oil leads at roughly 34%, with propane and wood adding more. So a Worcester HVAC company spends much of the year on gas boilers and furnaces in city two-families, while a company based in Spencer, Rutland or Uxbridge spends it on oil burners, propane furnaces and, increasingly, the heat pumps that replace them.
That split decides which rebate you can get, which license matters most, and how urgent the calendar is.
Why 2026 is the year to price a heat pump
Mass Save's heating rebates for 2026 come in four tiers, and the one you land in depends on how much of the house the heat pump will carry. Replace the whole heating load and the program pays $2,650 for each ton of capacity, topping out at $8,500. Keep the old boiler for the coldest days and you fall into the partial-home tier, which pays $1,125 a ton under the same $8,500 ceiling, with two $500 add-ons available, one for weatherizing first and one for having the system properly sized. A basic tier pays $250 a ton with a $2,500 limit. Households that qualify by income and are leaving oil, propane or electric resistance heat can reach the enhanced offer, which goes as high as $16,000 and in some cases covers the whole job through Mass Save's Turnkey Services.
The catch is the date. These figures apply only to systems that are running in the house by the last day of 2026, and the rebate forms must reach Mass Save by the end of February 2027. Anything installed in the new year earns less: $2,350 a ton for whole-home, $1,000 a ton for partial-home, and a $7,500 ceiling on both.
For an oil-heated cape in Leicester or a propane ranch in Hubbardston, that difference can be real money on a three- or four-ton system. If you are leaning toward a heat pump, get quotes now and ask each installer whether they can finish before the end of the year.
The gas house and the oil house need different contractors
A city gas boiler swap is a gas-fitting job. Under MGL c.142 §3, gas fitting is licensed, and a licensed plumber may do it as well as a licensed gas fitter. Look up whichever one will be on the permit using eLIPSE.
Ductwork is a separate trade. Sheet metal workers are licensed under c.112 §237, and a central air or ducted heat pump job in a Shrewsbury colonial will usually involve one. The outdoor unit and its disconnect need an electrician.
So the HVAC "company" on your quote may really be three or four license holders. That is normal. Ask the company to name which license covers each part: the gas line, the ducts, the wiring and the refrigerant work. Then check the names you can on eLIPSE.
Sizing a heat pump in an old, leaky house
Rebate math depends on tonnage, and tonnage depends on how much heat the house loses. A drafty Worcester triple-decker or a 1950s cape in Millbury with little insulation will need a bigger system than the same floor area built recently.
That is why Mass Save's partial-home tier carries a weatherization bonus and why its insulation program offers 75% to 100% off approved insulation and air sealing, with no-cost work for income-eligible households and separate offers for renters in one- to four-unit buildings. Tightening the house first can mean a smaller, cheaper heat pump and a lower bill afterward.
A good installer will do a room-by-room heat-loss calculation, not size by square footage. Ask to see it, and ask how the system will handle the coldest nights in the Wachusett hills or the north county. If they propose keeping the oil boiler as backup, ask how the controls will decide which system runs.
Sheet metal, gas and wiring permits for a new system
Worcester's Building & Zoning division issues sheet metal permits along with gas, plumbing, electrical and building permits, and applications are filed online. A furnace replacement, a new boiler, a ducted system or a mini-split will need one or more of them. The licensed contractors file; you should not have to.
Outside the city, the installer files with your town. In Grafton, Oxford or Templeton that means the town's building, gas and wiring inspectors, each on their own schedule. Ask the installer to put the permit fees in the quote and to tell you when each inspection is booked. Some Mass Save paperwork asks for installation details, so keep the permit records with your rebate file.
Tonnage, ducts and oil tanks: what pushes a heating quote up
The calculator default for a typical heating or cooling project in Greater Worcester is roughly $4,800 to $10,900 before rebates, and you can run your own numbers against the local estimate. Things that push past it:
- More tonnage for a larger or poorly insulated house.
- New ductwork, especially in a building that never had any.
- An electrical service upgrade to carry the heat pump.
- Removing an oil tank once the oil boiler goes.
- Mounting outdoor units on a three-decker where there is little yard.
Ask each bidder to write down the equipment model, the tonnage, which rebate tier they are assuming and who files the Mass Save paperwork. Two quotes for "a heat pump" are only comparable when those match.
Heat pumps in a rented three-decker
Worcester has a lot of small landlords, and more than half of the city's households rent. If you own a three-decker, a heat pump project raises questions a single-family owner never faces. Each unit may have its own gas furnace or boiler, its own meter and its own thermostat. Converting one floor at a time is possible, and many owners do it as units turn over.
Ask the installer to lay out the plan unit by unit, including where each outdoor condenser will sit. Back porches and narrow side yards fill up fast on a triple-decker lot. Ask too who pays the electric bill in each unit after the conversion, because a tenant who used to pay for gas may now pay for heat through the electric meter.
Mass Save's insulation program runs separate offers for renters in buildings of one to four units, and the landlord can coordinate with tenants so the walls are tightened before the equipment is sized.
Writing the rebate deadline into the heating contract
A heat pump or boiler replacement on an owner-occupied home is usually home improvement work, and Massachusetts requires a signed written contract for any such job over $1,000 under c.142A §2. The paper should show the price, a payment schedule, dates and the contractor's registration number. The deposit is capped at one-third, unless special-order equipment costs more.
Write the rebate assumptions into the contract too. If the price you agreed to depends on a 2026 rebate, the contract should say what happens if the install slips into 2027.
