Winterizing Your Home: The Tasks That Matter Most in Cold Climates

Identify every pipe that runs through an unheated space: crawl spaces, exterior walls, garages, and unfinished basements near foundation walls. Wrap these pipes with foam sleeve insulation, secured with tape at joints. For any outdoor faucets with an interior shut-off, close that valve and open the outdoor spigot to drain remaining water. Disconnect and drain garden hoses entirely and store them indoors.

Replace the furnace or heat pump filter — most systems need this every 1–3 months, and a clogged filter both reduces heat output and strains the motor. If your furnace or boiler is due for a professional tune-up (generally recommended annually), schedule it now, before HVAC companies are fully booked with emergency calls. Bleed hot water radiators if you have a hydronic system by opening the bleed valve until water flows without air pockets.

Start at the top: check the attic hatch or pull-down stairs for gaps and add weatherstripping or an insulating cover. Move to windows — run your hand around the interior frame on a cold or windy day and feel for airflow. Apply interior rope caulk or exterior caulk to gaps at the frame-wall junction. Check exterior doors for daylight visible around the perimeter and replace worn weatherstripping or door sweeps as needed. Pay attention to penetrations where pipes, wires, or ducts pass through exterior walls — a small tube of expanding foam sealant handles these efficiently.

Clear gutters completely of leaves, twigs, and debris so meltwater can drain freely. Blocked gutters allow ice dams to form at the roof edge — ice backs up under shingles, and when it melts, water can enter the wall and ceiling. While you have a ladder out, visually inspect visible shingles for lifted edges, missing tabs, or cracked sections, and check that flashing around chimneys and vents is still flat and sealed. Significant roofing issues should be addressed by a qualified roofing professional before snow adds load.

Test all smoke detectors and carbon monoxide detectors — winter is when heating appliances run hardest and CO incidents are most common. Replace batteries in any detector that chirps or fails its test. Then reverse your ceiling fans to run clockwise on a low setting: this pushes warm air that collects at the ceiling back down along the walls, evening out room temperatures without changing your thermostat setting.

If you have an in-ground irrigation or sprinkler system, hire a licensed irrigation professional to blow it out with compressed air — trapped water in underground lines will crack PVC fittings when it freezes. Confirm all exterior hose bibs are drained and, for frost-free models, that no hose is still connected (a connected hose defeats the frost-free design). If your garage contains any plumbing — water softeners, utility sinks, or supply lines — either insulate those runs or ensure the garage is kept above freezing with a minimal heat source.