Winter Preparedness: Thermal Resilience

Survival in extreme cold is a thermodynamics problem: you must generate heat faster than your environment sheds it.

1. The Thermal Envelope: Finding Leaks

Infiltration: Air leaks account for up to 30% of heat loss.
Concrete Tool: Use a FLIR thermal camera or an infrared thermometer to identify "Cold Spots" during a freeze. Check window seals, door sweeps, and electrical outlets on exterior walls.
Mitigation: Use "Draft Dodgers" (weighted fabric tubes) at the base of doors and shrink-wrap plastic film (e.g., 3M Window Kit) over leaky windows to create a dead-air space.

If the grid fails, most furnaces will not work because their blowers and control boards require 120V AC.

Indoor-Safe Propane: The Mr. Heater Buddy series is the only widely available heater rated for indoor use. It has an Oxygen Depletion Sensor (ODS) and a tip-over switch.
BTU Requirements: To keep a 200 sq ft room at 65°F when it is 20°F outside, you need approx. 4,000–6,000 BTU/hr.
Concrete Safety: Even with an ODS, you MUST have a battery-powered Carbon Monoxide (CO) detector. Crack a window 1/2 inch to ensure fresh oxygen supply.

Drip the Faucets: Keeping water moving through pipes prevents the formation of "Ice Plugs" that cause bursts.
PEX-A Tubing: If building or retrofitting, use Uponor PEX-A. It is cross-linked polyethylene that can expand up to 3x its diameter when frozen and return to its original shape without cracking.
Main Shutoff: Know where your main water shutoff is. If a pipe bursts, you must stop the flow immediately to prevent structural damage.

The Layering System:
1. Base: Synthetic or Merino Wool (wicks moisture). Never use cotton ("Cotton Kills" because it loses all R-value when wet).
2. Mid: Fleece or Down (traps air).
3. Outer: Windproof/Waterproof shell.
Concrete Spec: A high-quality wool blanket (e.g. 80% wool) has an R-value of approx. 1.5. Combining three blankets provides R-4.5, sufficient for survival in a 40°F room.

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