The twenty-year-old furnace at Roseholme Cottage has a cracked heat exchanger. Oh, it's not a large crack, just a long, lovely, meandering hairline. It's not spewing CO into the house instead of up the flue, not yet -- but a little dab of that stuff will do you and the crack is likely to get worse.
The heat exchanger is pretty much the heart of the system, so we'll be replacing the furnace. It's a medium-efficiency two-stage gas type and we'll get another of the same. Scheduled for the second week of November at the price of a high-mileage used car in good shape. Ouch.
In the meantime? No running the furnace overnight, or when no one is home. We have a radiator-type space heater that will keep the place warm on its lowest setting* if outside temperatures stay above 45 F, and it only gets used when there's someone to watch it. Here's hoping for no cold snaps.
* The lowest setting would be the one that doesn't produce noticeable heating at the receptacle. This is important if you're going to run the heater for long periods of time: once heat has changed the temper of the contacts in the wall socket, they'll start to get loose. The looser they fit, the more they'll heat up. The more they heat up, well, you get the picture. Eventually the plastic parts soften. That would be bad.
BUILDING A 1:1 BALUN
10 months ago