Idaho winters are no joke. From the mild Treasure Valley (where temps still drop below freezing) to mountain communities facing -20°F nights, winter preparation protects your home and your wallet.
Use this comprehensive checklist to prepare your home for Idaho's coldest months.
Heating System Preparation
Schedule a Professional Tune-Up
Before heating season begins:
- Replace air filter (or clean if reusable)
- Test thermostat operation
- Clean burner assembly and heat exchanger
- Check gas connections for leaks
- Verify safety controls function
- Test carbon monoxide detectors
Cost: $100-$200 for standard maintenance; worth every penny to avoid mid-winter breakdowns.
Heat Pump Considerations
If you have a heat pump:
- Clean outdoor unit of debris and vegetation
- Verify defrost cycle operates
- Check auxiliary heat strips function
- Understand when backup heat activates
Wood Stove and Fireplace
If using wood heat:
- Schedule chimney sweep (creosote removal)
- Inspect chimney cap and spark arrestor
- Stock seasoned firewood (20% moisture or less)
- Test smoke detectors in same room
Plumbing Protection
Exterior Prep
Hose Bibs:
- Disconnect and drain all garden hoses
- Turn off interior shut-off valves to exterior faucets
- Open exterior faucet to drain remaining water
- Consider insulated hose bib covers for extra protection
Irrigation Systems:
- Professional blowout with compressed air
- Drain backflow preventers
- Shut down controller
Swimming Pools/Hot Tubs:
- Winterize per manufacturer specifications
- Drain exposed plumbing
- Cover to prevent debris accumulation
Interior Protection
Vulnerable Pipes:
- Insulate pipes in unheated spaces (crawlspace, garage, exterior walls)
- Know location of main water shut-off
- Cabinet doors under sinks on exterior walls: leave open during cold snaps
- Heat tape for chronically freezing pipes
Freeze Prevention Tips:
- Keep thermostat at 55°F minimum, even when away
- Open taps to a trickle during extreme cold
- Close crawlspace vents (debated—consult your inspector)
Windows and Doors
Weather Sealing
Check for Drafts:
- Close windows and doors; run your hand around edges
- Use smoke pencil or incense to visualize air movement
- Check threshold seals for gaps
Solutions:
- Replace worn weatherstripping
- Caulk gaps between frames and walls
- Apply rope caulk to drafty windows
- Install door sweep if light visible under door
Window Treatments
- Heavy curtains provide insulation layer
- Close curtains at night, open on sunny days
- Window insulation film for single-pane windows
- Storm windows if available
Roof and Gutters
Gutter Maintenance
Before first freeze:
- Clean all debris from gutters and downspouts
- Verify downspouts direct water away from foundation
- Check gutter slope and attachment
- Consider gutter guards for future seasons
Ice Dam Prevention
Ice dams form when attic heat melts snow, which refreezes at cold eaves. Prevent with:
- Adequate attic insulation (R-49 to R-60 in Idaho)
- Proper soffit ventilation (don't block with insulation)
- Roof rakes to remove snow buildup
- Heat cables along eaves (last resort)
Roof Check
- Walk the roof or inspect from ground with binoculars
- Look for damaged, curled, or missing shingles
- Check flashing around chimneys, vents, skylights
- Clear debris from valleys
Attic and Insulation
Attic Inspection
- Verify insulation depth (12-16 inches of fiberglass = R-38 to R-49)
- Check for gaps around attic hatch
- Ensure bathroom fans vent outside, not into attic
- Look for pest entry or activity
- Verify soffit vents aren't blocked
Air Sealing
Focus on:
- Attic hatch or pull-down stair
- Plumbing and electrical penetrations
- Recessed light housings (IC-rated?)
- Chase ways around chimneys and flues
- Duct boots where ducts enter floors
Exterior Preparation
Siding and Trim
- Inspect for damage that could allow moisture infiltration
- Caulk gaps around windows, doors, and penetrations
- Address peeling paint (indicates moisture problems)
Foundation
- Check for cracks (repair before ground freezes)
- Ensure proper drainage away from foundation
- Clear debris from foundation vents
- Consider covering foundation vents (controversial—depends on situation)
Decks and Porches
- Clear leaves and debris
- Check for rot or damage before snow covers
- Apply sealer if due for maintenance
- Store furniture or cover
Safety Devices
Carbon Monoxide Detectors
With homes sealed tight and furnaces running:
- Test all CO detectors
- Replace batteries
- Replace detectors over 7 years old
- Ensure one on every level and near sleeping areas
Smoke Detectors
- Test all smoke detectors
- Replace batteries (even hard-wired units have backup batteries)
- Replace detectors over 10 years old
- Clean dust from sensors
Fire Extinguishers
- Verify charged and accessible
- Check expiration dates
- Know how to use (PASS: Pull, Aim, Squeeze, Sweep)
Emergency Preparation
Power Outage Kit
Idaho winter storms can knock out power for days:
- Flashlights and extra batteries
- Battery-powered or hand-crank radio
- Portable phone chargers
- Blankets and warm clothing accessible
- Non-perishable food requiring no cooking
- Bottled water (1 gallon per person per day for 3 days)
- Cash (ATMs and card readers won't work)
Backup Heat
Options for power outages:
- Wood stove or fireplace (keep wood stocked)
- Propane heater (never use unvented heaters indoors)
- Generator (outdoor use only, away from windows)
- Know how to safely drain pipes if extended outage
Generator Safety
If using a generator:
- NEVER operate indoors or in garage
- Place 20+ feet from any window or door
- Use heavy-duty outdoor extension cords
- Don't backfeed into household wiring (use transfer switch)
Month-by-Month Winter Maintenance
| Month | Tasks |
|---|---|
| October | Complete all exterior prep, schedule HVAC tune-up |
| November | Test heating system, check weatherstripping |
| December | Monitor for ice dams, clear snow from vents |
| January | Mid-winter inspection, test safety devices |
| February | Watch for ice dam damage as melt begins |
| March | Transition to spring prep, inspect for winter damage |
Professional Winter Inspection
Consider a pre-winter home inspection that focuses on:
- Heating system condition and safety
- Insulation adequacy
- Weatherization opportunities
- Potential freeze risks
- Safety device verification
An autumn inspection prevents winter emergencies.
Related: Spring Maintenance Checklist | Energy Efficiency Upgrades