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Is that the approved sort of tape, which has a shiny metallic finish? I wonder if its emissivity is just a lot lower than the adjacent fiberglass, while the temp is the same? By one emissivity table...

Thanks - the VisionPro looks like it'd do the trick (finally got an inst manual off the Honeywell site after about ten minutes of clicking and aborting their infinite-looping javascripts about half a...

Who knows of a 7-day programmable stat made for a heat-only application? I posted the same question several weeks ago in commercial, but a resi stat would do the trick if anyone has one to suggest.
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Huh ... dash just posted in another thread that the ESP measurement should include everything external to the manufacturer supplied furnace blower and cabinet - that makes me feel better because...

By way of comparison, about one third is what I lose today on the longest duct run here, an uninsulated galvanized duct going through the (otherwise) unheated basement. (I leave it that way because...

First, you should check me on whether 30 degrees is really acceptable - that's off the top of my head and I was thinking of a condensing furnace which you have not got. The temp rise range that's...

It's normal for them to have a bit of a "coggy" sound as they ramp up from a full stop. Is this a significant change from what you were used to before? Has the blower wheel been cleaned lately? ...

Ok, so your firing rate is about 6.5% low on both stages. I think Portland is within 1000 ft of sea level, so there is no reason for the furnace not to be adjusted to its full nominal firing rate....

I've heard of that being done, and been tempted myself, with old natural-draft ribbon burner furnaces (where opinions vary on the relative merits of reducing orifice size or simply closing one off...

Hi,

Who makes a programmable 24V stat (7-day preferable) that is either heat-only, or has a config option that definitely makes it heat only so there is no control on the front that could possibly...

I'm with Midwest. You don't sound defeated by the system yet, and there's no benefit to you or to the system if you are. Go ahead and supply your calculations and your insistence, to be preserved in...

The two-stage Carrier the homeowner referred to is smaller (40k high stage). I don't know of any smaller condensing furnace. The smallest residential 80% I know of is the 28k Fedders.

I agree, talk with the city inspector yourself. They're often reasonable folks.

It's not necessarily that the contractor is out to mislead you, but could have had a talk with the inspector's...

Aha. Would not have been a bad guess, given it didn't seem to matter which wire you wiggled.



You meant an open, right hvac? a short would have needed something to short to.

There's more than one mystery here. In a couple of side plots, I might wonder if the hole in the wall at your thermostat mounting base is well sealed, or if the thermostat is one that has an...

Counterintuitive, isn't it? Maybe part of why flight didn't get invented earlier.

Here's a fun trick. You need two things: 1. kitchen faucet. 1. soup spoon.

Open the faucet to make a nice...

Depends on age of house and wiring method. Romex is happy in an insulated wall. Knob-and-tube is not - those wires were rated for free circulating air in that space. Blowing insulation into a wall...

Thanks for that - I could buy the density as the explanation why they give different SP budgets for heat and cooling. Good to know it doesn't include the filter (though that strikes me as a bit of a...

Dang, Robo, you were my best hope for a serious answer on this one.

I understand how you might have a hair trigger about the brand because I've seen the kind of heat you take about it in other...

hehe. Well, there's time yet. So far my only questions that bear on Goodman are about whether their CFM/temp rise table might have a typo or there might have been some issue with ECM programming, and...

Some of the replies were to multiply the nameplate amps for the motor by 120 to get watts. Ok in a pinch but will tend to overestimate the cost - a motor won't always draw its nameplate amps. A PSC...

Thanks renaisanse and Robo. Just to clarify, I didn't have any interest in changing the piston, as it is exactly the one on the condenser nameplate; the only reason I mentioned that the current...

AFAICT, the Infinity 96 is the 58MVP. But be careful, 58MVP isn't a complete model number, that'll be something like 58MVPnnnXssscc where the sss is a 'series.' It might be that only certain recent...

Eggzackly. Clocking the meter tells you how many BTUs per hour are going in. About 20% of those are going to keep your chimney warm, and the other 80% better be accounted for in so many cubic feet...

A friend inherited an ancient, oversized natural draft gas furnace with a fairly recent AC retrofit (38TZA024300 outdoors, CC5AXA024014 indoors with R410a and piston 61, which is not the piston shown...