Guide · Home heating in Cottage Lake

The Heating Systems You’ll Find in Cottage Lake Homes

Cottage Lake houses run on almost every kind of heat. Some streets have PSE natural gas and some don’t, lots are big, and many homes have been added onto over the years. Here is how each common system works, what tends to go wrong with it, and what people usually upgrade to.

Updated September 2026

Gas and propane furnaces

A forced-air furnace pulls air from the house through a return grille, runs it through a filter, heats it over burners and a heat exchanger, and blows it back out through the supply ducts. Gas and propane furnaces work the same way; the burners and gas valve are set up for one fuel or the other.

Common trouble: a clogged filter, a dirty flame sensor that shuts the burner off, a failing igniter, or a blower motor on its way out. A furnace that is 15 to 20 years old and needs a major part is worth comparing against a replacement.

Diagram of how a forced-air furnace filters, heats and circulates air

Oil furnaces and boilers

Some older homes in the area still heat with fuel oil. These systems need yearly cleaning, and the tank itself should be checked. Many owners replace an aging oil furnace with a heat pump, often keeping the existing ducts.

Electric baseboards and wall heaters

Electric resistance heat is simple and quiet, but it is the most expensive way to heat with electricity. It’s common in additions, bonus rooms and houses built without ducts. Switching these rooms to a ductless heat pump is the upgrade PSE’s conversion rebate is aimed at.

Ducted heat pumps

A heat pump moves heat instead of making it. In winter it pulls heat from outdoor air, even air below freezing, and moves it inside through refrigerant lines. In summer a valve reverses the flow and it cools the house. Cold-climate models keep heating well into the teens and below.

Common trouble: iced-over coils that don’t clear in defrost, low refrigerant from a leak, a failing reversing valve, or a unit buried in leaves or snow. Some frost in cold, wet weather is normal. A block of ice that stays is not.

Diagram of how a heat pump moves heat from outside air into the house

Dual-fuel (hybrid) systems

A dual-fuel setup pairs a heat pump with a gas furnace on one thermostat. The heat pump handles the mild months and the furnace takes over in cold snaps. For homes with PSE gas, it’s a way to add air conditioning and cut gas use without giving up the furnace, and PSE has a rebate for it.

Diagram of a heat pump and gas furnace sharing ducts, with a switchover around 35 degrees

Ductless mini-splits

A mini-split has an outdoor unit and one or more heads mounted on the wall inside, connected by a small line set through the wall. Each head runs on its own setting. They suit houses without ducts, additions, bonus rooms over garages, shops and guest suites, all of which are common on larger Cottage Lake lots.

Diagram of a ductless mini-split with one outdoor unit feeding three indoor heads

How to tell what you have

Not sure? Take a photo of the equipment nameplate and send it with your request.

A metal flue or white PVC pipes coming off the unit usually mean a gas or propane furnace
A propane tank on the property means propane; an oil tank or fill pipe means oil
A single outdoor unit with ducts inside is a central AC or a heat pump; the nameplate will say which
An outdoor unit plus wall-mounted heads is a ductless system
Heaters under the windows and no ducts mean electric baseboards

Heating System Questions

Will a heat pump keep up in a Cottage Lake cold snap?

A properly sized cold-climate heat pump does for most homes. Many keep a furnace or electric backup for the coldest nights, and a dual-fuel setup handles that automatically.

Can I keep my ductwork if I switch to a heat pump?

Usually, yes, if the ducts are sized and sealed well. Leaky ducts in a crawl space or attic are worth fixing at the same time.

Why does my heat pump blow steam in winter?

That’s the defrost cycle melting frost off the outdoor coil. It’s normal and lasts a few minutes. If the coil stays iced, have it checked.

How often should the filter be changed?

Check it every one to three months, more often in wildfire smoke season or with pets. A clogged filter is one of the most common causes of a furnace shutting itself off.

Related Services in Cottage Lake

Not sure which system is right for your house?

A technician can look at what you have and walk through the options.

Call (425) 491-6784