Types of Residential Heating and Cooling Systems: A Massachusetts Homeowner's Guide

When people ask what kind of heating and cooling system they need, they usually mix up two separate questions. The first is how the system makes heat or cooling. The second is how it delivers that comfort to the rooms of your house. A furnace burns fuel to make heat and sends it through ducts. A boiler heats water and sends it through pipes. A heat pump moves heat from one place to another using refrigerant, and it can deliver the result through ducts or straight into a room with no ducts at all.

Keeping those two questions apart makes the whole subject easier. It also explains why the house you already have matters so much. If your home has ducts, the easiest upgrades use them. If it has radiators, the easiest heating upgrade keeps them. Everything else is a bigger project with its own trade-offs.

This guide covers the main residential systems you will meet in Massachusetts. If you would like a free look at your own house, call or text us at (781) 353-8852, or read about our heating and cooling installation service.

A furnace heats air and a blower pushes it through ducts to registers in each room. Most furnaces in New England burn natural gas or heating oil, and some burn propane. Electric furnaces exist but are less common here because of the cost of electricity for whole-house resistance heat.

The strengths of a furnace are simple. It heats quickly, it delivers strong heat on the coldest days, and the same ducts and blower can serve central air conditioning. The drawbacks are that forced air can be drier and sometimes noisier than other systems, and the ducts need to be well designed and sealed.

• Gas furnaces: The most common in homes that have a gas main. Standard models are around 80 percent efficient, and condensing models reach 90 percent or more.
• Oil furnaces: Common where gas is not available. They need a fuel tank and yearly burner service.
• Single-stage, two-stage, and variable speed: More stages generally mean quieter operation and more even temperatures.

For repair and replacement details, see our pages on furnace repair and furnace installation.

A boiler heats water. In a hot water system, a pump circulates that water through baseboard, radiators, or tubing in the floor. In a steam system, the water is boiled and the steam rises to radiators on its own. Boilers can burn gas, oil, or propane, and they are especially common in older South Shore houses.

People who have boiler heat tend to love it. It is quiet, there are no drafts, and the warmth feels even. The limits are that a boiler provides heat only, so cooling has to come from a separate system, and the pipework makes some changes more complicated than they are with ducts.

We work on both. See boiler repair and installation.

A heat pump uses electricity to move heat instead of creating it. In summer, it pulls heat out of your house and releases it outside, exactly as an air conditioner does. In winter, it reverses and pulls heat from the outdoor air into your house. Because it moves heat rather than burning fuel, a heat pump can deliver more heat energy than the electricity it uses.

Cold climate models are designed to keep working in low temperatures, which is what makes them practical in Massachusetts. Their output falls as the temperature drops, so design matters, and some homes keep a furnace or boiler as backup. ENERGY STAR has a useful overview of air-source heat pumps.

• Ducted air-source heat pumps: Use your ductwork, with an indoor air handler and an outdoor unit.
• Ductless mini-splits: An outdoor unit connected to one or more indoor units. No ducts needed.
• Ground-source (geothermal) heat pumps: Exchange heat with the ground through buried loops. Very efficient and a much larger installation project, which is why it is a separate decision from the rest of this guide.
• Hybrid or dual fuel: A heat pump that works with a furnace and switches to the furnace in the coldest weather.

See our service page on heat pumps and ductless mini-splits, and our comparison of a heat pump and a furnace in Massachusetts.

A central air conditioner cools through the same ducts as a furnace. An outdoor condenser releases heat, and an indoor coil above the furnace or in an air handler cools the air. It is a good fit for any house with decent ducts and a desire to cool every room evenly.

For houses without ducts, the options are ductless mini-splits, a small-duct system in some cases, or window units. We cover the decision in central air conditioning installation and in our cost guide for central air in Massachusetts.

• Electric baseboard: Simple and cheap to install, expensive to run in a cold climate. Often a candidate for replacement or supplementing with a heat pump.
• Radiant floor heating: Hot water tubing in the floor. Very comfortable, usually found in new construction or major renovations.
• Wood and pellet stoves: Often a supplement to the main system. They need chimney maintenance and a plan for fuel.
• Window and portable units: Useful for small spaces. Less efficient and less convenient than a permanent solution.

Work through these questions, and the options narrow quickly.

Most homeowners end up in one of three places. Either they replace what they have with a better version of it, they add cooling to a heating system they already like, or they move to a heat pump for part or all of the house. All three are reasonable, and the best path depends on your answers above. If you want a person to walk through it with you, we offer a free estimate.