Energy saving upgrades that make sense, and where to start

Start by finding where your energy goes

Before you spend money, learn how your house actually uses energy. Pull a year of utility bills and notice which months spike, since that tells you whether heating, cooling or something else drives your costs. Then look into a home energy assessment. Many utilities offer one, sometimes at low or no cost, and independent energy auditors can run a blower door test that depressurizes the house to show where air sneaks in, often with an infrared camera to spot missing insulation. Program details vary by utility and state. Even a do-it-yourself walkthrough on a windy day, feeling for drafts with the back of your hand, will point you toward the leakiest spots.

• Read the assessment report

  A useful report ranks problems and suggests fixes in order. Ask the auditor which items address comfort, which address energy use and which are safety concerns.

Seal the air leaks first

Air sealing is usually the least expensive place to start, and it often improves comfort right away. The largest leaks tend to hide in the attic and basement, not around windows. In the attic, look for gaps where plumbing vents, wiring and ductwork pass through the ceiling, around the attic hatch and along the tops of interior walls. In the basement, the rim joist where the house sits on the foundation is a common trouble spot. Throughout the house, weatherstrip doors, caulk gaps in trim and add foam gaskets behind outlet covers on exterior walls. Keep foam and caulk away from chimneys and flues, which need fire-rated materials and clearances set by local code.

• Check combustion safety

  Tightening a house can affect how gas or oil furnaces, water heaters and fireplaces vent. After major sealing, have a qualified pro test for proper drafting, and keep carbon monoxide alarms working.

• If you smell gas

  Leave the house, then call your gas utility or emergency services from outside. Don’t flip switches, and don’t try to find the leak yourself.

Add insulation where it counts

Once the big leaks are sealed, insulation keeps heat where you want it. The attic is often the easiest and most rewarding place to start, since loose-fill or batts can go right over what’s already there. How much you need depends on your climate zone and local code, so ask an insulation contractor or your local building department. Basement walls, crawl spaces and rim joists come next in many homes. Finished walls are harder to reach and usually need a contractor who blows insulation in through small holes. Keep insulation off recessed lights that aren’t rated for contact, and install baffles so it doesn’t block soffit vents.

• Vermiculite in older attics

  Loose, pebble-like vermiculite insulation can contain hazardous mineral fibers. Don’t disturb it; have it tested and handled by a qualified professional before any attic work.

• Knob-and-tube wiring

  Some older homes still have this early wiring, which shouldn’t be buried in insulation. Have a licensed electrician evaluate it before anyone insulates around it.

Set up a thermostat that fits your life

A programmable or smart thermostat helps most when your household keeps a predictable schedule and the house sits empty, or everyone is asleep, for long stretches. Setting the temperature back a few degrees during those hours reduces how hard your system works, but how much that saves depends on your climate, your equipment and how you used the thermostat before. If you already adjust it by hand every day, the gain may be small. Check compatibility before buying, since some models need a common wire, and heat pumps and multi-stage systems need a thermostat configured for them. Line-voltage thermostats for electric baseboard heat are a different type and a job for an electrician.

• Heat pump setbacks

  Deep setbacks on some heat pumps can trigger backup electric heat during recovery, which may cost more. Ask your HVAC contractor how to schedule setbacks for your system.

• Don’t close off rooms

  Shutting supply vents in unused rooms often doesn’t help in forced-air homes and can strain the system. Ask an HVAC pro about balancing or zoning instead.

Keep heating and cooling equipment in shape

Your furnace, heat pump or air conditioner is usually the biggest energy user in the house, so basic care matters. Change or clean filters on schedule, keep outdoor units clear of leaves and shrubs, and book regular tune-ups with a licensed HVAC contractor. Ductwork running through attics, garages or crawl spaces can leak conditioned air into spaces you don’t live in, so sealing and insulating those runs is often worthwhile. When it’s time to replace equipment, ask for a room-by-room load calculation instead of simply matching the old unit’s size. Gas lines, refrigerant and electrical connections are for licensed pros only.

• Duct tape isn’t for ducts

  Ordinary cloth duct tape tends to dry out and peel. Use mastic or foil tape labeled for ductwork, and leave connections at the furnace itself to a pro.

Trim what it costs to heat water

Water heating is a steady, year-round load, so small changes add up over time. Ask your plumber about a temperature setting that balances comfort, energy use and scald risk, especially with young children or older adults at home. Insulate the first few feet of hot water pipe where it leaves the tank, fix dripping faucets and consider efficient showerheads. If your water heater is near the end of its life, look at options before it fails, since an emergency replacement leaves little time to compare. Gas water heaters and any change in fuel type involve venting, permits and code requirements that vary by city, so hire a licensed plumber.

• Heat pump water heaters

  These units need room around them, a condensate drain and sometimes new wiring. They also cool the space they sit in, which matters in a small closet or chilly basement.

Think twice before replacing windows for energy alone

New windows are one of the most visible upgrades, and replacement can be the right call when frames are rotting, seals have failed or old sashes won’t open or lock. As an energy project on its own, though, window replacement tends to be expensive for what it changes, and air sealing or insulation can often do more for less. Before replacing, try the simpler fixes: new weatherstripping, caulk around interior trim, storm windows, cellular shades or window film on sunny exposures. If you do replace, compare the energy ratings on the labels rather than relying on sales claims, and ask how the installer will seal and flash each opening.

Finish with lighting, appliances and incentives

Smaller changes round out the plan. Swap remaining incandescent bulbs for LEDs, starting with the lights you use most. When an appliance needs replacing anyway, compare the energy use figures on the label rather than retiring a working unit early. Use a switched power strip for electronics that draw power while off, and unplug the old second refrigerator in the garage if you don’t really need it. Before any big purchase, look into rebates, tax credits and utility programs, which change often and vary by state, utility and year. Confirm eligibility in writing before you buy, and don’t let an incentive push you toward an upgrade you wouldn’t otherwise choose.