The cold-weather rules in writing

Source (area) What it says about cold
Wet & Forget Outdoor concentrate label Above 32 degrees while applying and for 4 to 5 hours after
Wet & Forget hose-end label Above 35 degrees while applying and for 4 to 5 hours after
HiCleaners (Revere, MA) Effective in cooler months as long as temperatures stay above freezing
Applewood Exterior (Pomfret, CT) Reschedules for heavy rain or temperatures below 40°F, usually within a few days

The labels set the floor at 32 to 35 degrees, and the Connecticut company’s own cutoff runs warmer, at 40°F. It prices house washing from $389 for a single-story home and $475 to $575 for a two-story colonial, and a Nashville company puts most local house washes at $300 to $500.

Why November beats December

NOAA’s 1991–2020 normals for Louisville International Airport show the gap. November averages 22.4 days that reach 50°F or warmer; December averages 12.5, with an average low of 32.1°F and 16.8 nights at 32°F or below. That’s about 10 fewer mild days to land a wash on, and more nights when water left on steps and walks can freeze.

So when you book, ask what the company’s cold cutoff is and what happens to the date if the forecast drops. Our questions to ask a house washing company cover the rest of the call, rain on wash day covers the other weather rule, and if you own a machine, winterize the pressure washer before the first hard freeze. How we check labels and prices is on our methodology page.

Sources

Based on 8 sources · How we price

Checked 2026-11-02. Product labels are quoted for what they say about their own products.