How to Winterize Your Home in Arizona

Most people assume Arizona homeowners do not need to worry about winterizing their homes. After all, Phoenix rarely sees freezing temperatures — right?

Not quite. The Phoenix metro area averages 18 nights per year below freezing, and temperatures in outlying areas like Queen Creek, Cave Creek, and the East Valley can dip into the mid-20s during cold snaps. Scottsdale and Gilbert have both seen burst pipes during hard freezes. And even when temperatures stay above freezing, Arizona winters bring their own maintenance needs.

Here is the complete winterization checklist for Arizona homeowners.

Burst pipes are the most expensive winter home emergency — repairs can cost $1,000–$15,000 depending on where the pipe is and how much water damage results. Arizona pipes are especially vulnerable because:

• Many Arizona homes have pipes routed through exterior walls or attics (where insulation is minimal)
• Homes are not built with the same freeze protection as homes in colder climates
• Homeowners are often caught off guard because freezes are infrequent

Insulate exposed pipes. Any pipe in an uninsulated attic, exterior wall, or garage is at risk. Foam pipe insulation sleeves cost $1–$3 per foot and take minutes to install. Focus on:

• Pipes in the attic
• Pipes on exterior walls
• Hose bibs (outdoor faucets)
• Pool equipment lines

Know where your main shutoff is. If a pipe does burst, you need to shut off the water immediately. Locate your main water shutoff valve now — before an emergency. In most Arizona homes it is near the water meter, typically at the front of the property.

Drip faucets during a hard freeze. When temperatures are forecast below 28°F, let faucets drip slightly — especially those on exterior walls. Moving water is much less likely to freeze than standing water.

Disconnect and drain garden hoses. A connected hose traps water in the hose bib, which can freeze and crack the fitting. Disconnect all hoses before the first freeze.

Insulate or cover hose bibs. Foam hose bib covers cost $3–$8 each and provide meaningful protection during mild freezes.

Your HVAC system has been running in cooling mode for six months. Before you need heat, have it serviced.

Schedule an HVAC tune-up. A professional tune-up ($80–$150) includes:

• Inspecting and cleaning the heat exchanger
• Checking gas connections and burner operation (for gas furnaces)
• Testing the heat pump in heating mode
• Replacing the air filter
• Checking refrigerant levels
• Inspecting electrical connections

Replace the air filter. If you have not replaced your HVAC filter since summer, do it now. A clogged filter reduces efficiency and can cause the system to overheat.

Test the heat before you need it. Turn on the heat in October — before the first cold night — to make sure it works. The last thing you want is to discover a problem at 11 PM when it is 35°F outside.

Check your thermostat. If you have a programmable or smart thermostat, update the schedule for winter. Set the heat to come on automatically when temperatures drop.

Clear the area around your furnace. Make sure there is at least 3 feet of clearance around your furnace or air handler. Do not store boxes, holiday decorations, or other items near the unit.

Many Arizona homes have gas fireplaces that sit unused for 8–9 months of the year. Before lighting it for the first time in fall:

Gas fireplaces: Have a technician inspect the gas connections, pilot light, and burner assembly. Check that the glass is clean and undamaged.

Wood-burning fireplaces: Have the chimney swept and inspected annually. Creosote buildup is a fire hazard. Check the damper to make sure it opens and closes properly.

Check the gas shutoff. Know where the gas shutoff for your fireplace is located.

Arizona's winter landscaping needs are very different from summer. Most desert-adapted plants need significantly less water in winter.

Adjust your irrigation controller. Reduce watering frequency by 50–75% compared to summer schedules. Most desert plants need watering only every 2–3 weeks in winter.

Drain drip lines before a hard freeze. If temperatures are forecast below 28°F, turn off the irrigation system and drain the lines. Frozen drip emitters and fittings are inexpensive to replace, but a cracked main line is not.

Protect frost-sensitive plants. Citrus trees, bougainvillea, and other frost-sensitive plants need protection when temperatures drop below 32°F. Cover them with frost cloth (not plastic) the evening before a freeze.

Check for leaks. Fall is a good time to walk your irrigation system and look for broken emitters, cracked tubing, or heads that are spraying in the wrong direction.

Arizona roofs take a beating from summer UV and monsoon storms. Fall is the ideal time to inspect for damage before winter rains arrive.

Look for damaged or missing shingles. After monsoon season, walk around your home and look for shingles on the ground or visible damage on the roof. Binoculars work well for this.

Check roof penetrations. Inspect the flashing around chimneys, vents, and skylights. Cracked or missing flashing is a common source of leaks.

Clean gutters and downspouts. Arizona does not have the leaf-fall issues of other climates, but gutters still collect debris — especially after monsoon season. Clogged gutters can cause water to back up under the roofline.

Schedule a professional inspection if your roof is more than 10 years old. A roofing contractor can spot issues that are not visible from the ground.

Arizona homes are built for cooling, not heating — which means many have significant air leaks that drive up heating costs in winter.

Check weatherstripping on doors. Slide a piece of paper under a closed door. If it slides easily, the weatherstripping needs replacement. Weatherstripping kits cost $10–$30 and take 30 minutes to install.

Inspect window seals. Look for gaps between the window frame and the wall. Caulk any gaps with exterior-grade silicone caulk.

Check attic insulation. Arizona homes are often under-insulated in the attic because the focus is on keeping heat out in summer. Adequate attic insulation (R-38 to R-60 for Phoenix metro) also keeps heat in during winter.

Seal around pipes and wires. Any penetration through an exterior wall or ceiling is a potential air leak. Use expanding foam sealant to close gaps around pipes, wires, and conduit.

Arizona's winter storms occasionally knock out power — especially in outlying areas. Be prepared.

Stock emergency supplies: Flashlights, batteries, a battery-powered radio, and enough water for 72 hours.

Know how to manually open your garage door. Most garage door openers have a red emergency release cord. Know where it is and how to use it.

Consider a generator. If you have medical equipment, a sump pump, or other critical electrical needs, a portable or standby generator is worth considering.

As temperatures drop, rodents and insects seek warmth — and your home is an attractive option.

Seal entry points. Mice can squeeze through a gap the size of a dime. Inspect the exterior of your home for gaps around pipes, vents, and the foundation. Seal with steel wool and expanding foam.

Check door sweeps. Garage doors and exterior doors should have tight-fitting sweeps that leave no gap at the bottom.

Schedule a preventive pest treatment. Fall is an ideal time for a preventive perimeter treatment to discourage scorpions, spiders, and rodents from entering.

TrustedPro USA connects Arizona homeowners with verified, licensed contractors for all your seasonal maintenance needs.

• HVAC in Phoenix
• HVAC in Scottsdale
• Plumbing in Phoenix
• Plumbing in Gilbert
• Roofing in Phoenix
• Roofing in Scottsdale
• Pest Control in Phoenix
• Pest Control in Gilbert
• Landscaping in Phoenix
• Landscaping in Scottsdale