How to Lower Your Heating Bill in Winter: A Plumber's Field Guide

To lower your heating bill in winter, focus on four levers that actually move the needle: seal the air leaks around doors, windows, and ducts; set your thermostat back when you are asleep or away; change a dirty furnace filter; and keep the heating system tuned so it runs efficiently. Everything else is a refinement of those four. Below is how I walk homeowners through each one, what you can safely do yourself, and where it pays to bring in a licensed tech.

Stop Paying to Heat the Outdoors

The cheapest heat is the heat you do not lose. Most of the waste I find on a service call is not the furnace working poorly, it is conditioned air escaping and cold air sneaking back in. Before you touch the equipment, close the envelope.

• Weatherstrip doors and windows. Run your hand around the frame on a windy day. If you feel a draft, replace the worn weatherstripping and add a door sweep at the bottom. This is an afternoon of work with a screwdriver and a caulk gun.
• Caulk the gaps. Seal around window trim, where pipes and wiring penetrate exterior walls, and along the sill plate in the basement. A tube of exterior-grade caulk goes a long way.
• Insulate the attic hatch. An uninsulated pull-down stair or hatch is a chimney for your heat. Add a foam cover and weatherstrip the edges.

Sealing leaky supply and return ducts in a crawlspace or attic is the one item on this list I would hand to a pro. Mastic sealant on the right joints makes a real difference, but it means crawling through tight, dirty spaces and knowing which connections matter.

Run the Thermostat Smarter

Setting your thermostat back while you sleep and while the house is empty is one of the simplest ways to cut runtime. A programmable or smart thermostat does it for you, so you are not heating empty rooms at full temperature for eight hours a night.

A practical schedule for a standard gas furnace:

1. Set a comfortable daytime temperature while people are home.
2. Drop it several degrees overnight and again during work and school hours.
3. Let it ramp back up before everyone is home or awake.

One caveat from experience: if you heat with a heat pump rather than a gas furnace, deep setbacks can backfire. Recovering from a big temperature swing kicks on the electric auxiliary heat strips, which are expensive to run. With a heat pump, keep setbacks modest, around two to three degrees, or use a thermostat designed to manage heat-pump recovery.

Give the Furnace What It Needs to Breathe

A clogged furnace air filter is the most common efficiency killer I see, and it is the easiest fix. When the filter is packed with dust, the blower has to fight to pull air through it. The system runs longer to hit the same temperature, and you pay for every extra minute.

Check the filter monthly during heating season and replace it when it looks gray and loaded, typically every one to three months depending on the filter and whether you have pets. Slide the old one out, note the size printed on the cardboard edge, and slide a new one in with the airflow arrow pointing toward the furnace. That is the whole job.

While you are down there, make sure nothing is stacked against the return vents or supply registers. Furniture and boxes blocking airflow force the same wasteful overwork as a dirty filter.

Keep the Equipment Tuned

An annual heating tune-up keeps the system running at the efficiency it was built for. A technician will check the burners and heat exchanger on a gas furnace, verify safe combustion, confirm the blower and motor are clean, and catch small problems before they turn into a no-heat call on the coldest night of the year. For a heat pump, that visit includes checking refrigerant charge and the defrost cycle, both of which a homeowner should not attempt.

If you want to learn more about furnace and heat-pump service, our heating repair and maintenance services page covers what a visit includes.

One More Lever Most People Forget

As a plumber, I will point you to a bill that hides in plain sight: your water heater. Many tanks ship set hotter than they need to be. Setting the thermostat on the tank to 120 degrees Fahrenheit is hot enough for a household, reduces standby heat loss, and lowers the risk of scalding. On an electric tank you can adjust this yourself; on a gas unit it is a simple dial. If you are unsure, ask during your next service visit.

A Safety Note Before You Tinker

DIY is great for filters, weatherstripping, and thermostat settings. It is not great for the inside of a gas appliance. Keep these lines firm:

• If you ever smell gas (a rotten-egg odor), leave the house and call your gas utility from outside. Do not flip switches.
• If your carbon monoxide alarm sounds, get everyone out and call for help. Make sure you have working CO detectors near sleeping areas.
• Never bypass or jumper a furnace limit switch or safety control to keep a unit running. Those switches exist to shut the system down before it becomes dangerous.

And a myth worth retiring: closing vents in unused rooms does not save money on a forced-air system. It raises pressure in the ductwork, which can cause leaks and strain the blower. Leave the registers open.

When to Call Patton

Seal the leaks, set the thermostat back, change the filter, and you will feel the difference. When you need a furnace tune-up, a duct-sealing job done right, or a heating system that is running longer and louder than it should, that is our work. Call Patton Plumbing, Heating, and A/C at (901) 489-2119. We are a family-owned, fully licensed and insured team serving the Greater Memphis area and West Tennessee, and we are glad to help you head into winter with a system that earns its keep.