November in Baltimore city

Detectors are the one system in your house where "it looks fine" means nothing — the sensor inside degrades on its own schedule regardless of how clean the outside is.

With around 86 freeze days a year in Baltimore city, this is the highest-value ten minutes on your calendar.

Scheduled ahead of Baltimore city's average first frost (11/09).

A space heater is a 1,500-watt appliance — a full circuit's worth of load — that lives on the floor near fabric and gets moved around by whoever's cold.

Scheduled ahead of Baltimore city's average first frost (11/09).

With ~86 freeze days a year in Baltimore city, winter isn't a surprise — but the FIRST hard freeze each season is still the one that does the damage, because it finds whatever changed since last year: the hose left on, the crawlspace vent knocked open, the cabinet remodel that put a sink pipe against an exterior wall.

Scheduled ahead of Baltimore city's average first frost (11/09).

Every fall the covers appear at the big-box stores, and every spring the service techs find what they did: coils sweated under vinyl all winter, rust where the moisture sat, and mouse nests in the wiring of the warmest sheltered box in the yard.

Scheduled ahead of Baltimore city's average first frost (11/09).

Gutters have one job: get roof water away from your foundation.

Crawlspace vents are one of building science's ongoing arguments, so here's the honest version for a vented crawlspace in a freeze climate: the vents exist to let summer moisture out, and in winter they mostly let freezing air in.

Scheduled ahead of Baltimore city's average first frost (11/09).

Out of sight is exactly how crawlspace problems get expensive — nobody looks until a floor feels soft.

Here's the part the bag-every-leaf tradition gets wrong: your lawn doesn't need rescuing from leaves.

That metal mesh over your stove has one job: grab airborne grease before it gets into the fan, the duct, or back into your kitchen air.

The range is the appliance most likely to start a fire in your house, and the fuel is almost always accumulated grease — under the burners, in the drip trays, filmed on the oven walls, and soaked into whatever's been living in the drawer underneath.

Small engines don't die of work; they die of storage.

Scheduled ahead of Baltimore city's average first frost (11/09).