How a Two Stage Gas Furnace Works

How a two stage furnace works. What makes a two stage furnace any different than a regular furnace? Are the components any different? In this video I go over what a two stage furnace is, how it works, and what extra or different components it has.
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This video is for educational purposes. All appliance and HVAC repair work should be done by a trained professional. Word of Advice TV is not responsible for any possible damages or injuries caused by the use or misuse of the provided information.
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[rdcleaners]

Just subscribed and watched a bunch of your videos. You do an awesome job, right to the point, thanks!

[jdubya]

Almost every time i search for information, one of your videos shows up. Thanks for all you do making videos

[Gary-xkqc]

Thank you young man for the information. Regarding two-stage furnaces you educated a 70 year old man

[marknagy]

You guy are an awesome teacher no doubt.

[nelsonm]

just got a two stage, great explanation! thank you!

[Rayram]

You are a real good at explaining the furnace and very articulate . Thank You

[enduringpromise]

FYI, the second stage is more efficient but it short runs which means less humidity is removed making the occupants feel less comfortable and it also is more wear on the furnace parts. In the north high efficiency is more cost effective. I just learned this from another great teacher.

[binfordtoolman]

Nice vid! Right to the point and clear explanation in simple terms. Wish more would follow your lead.

[ioreodream]

That was great. I work for a large thermostat company and I found this helpful with my learning. Also, I love the NFS 3 soundtrack! Great memories playing knock-out with the F355 on that game.

[alkodhanani]

Thanks Jay, for your extraordinary guidance. I've used your videos to help me fix my furnace twice and both times I remembered your goodwill and selflessness.

[sneakyquiet]

It would be great if you have a tutorial on wiring a 2stage unit compressor, condenser & thermostat

[jasonssmith]

Man I love your videos. You give the best advice man. I always look forward to learning from you man. Thank you so much for all the advice you

[surujnarinepundit]

Your videos are great, it helps me a lot. Can u do a video to why a two stage furnace will not go into high fire. Thank you

[imunty]

I have a Goodman GMH80905CN which is a two stage 80%, 80k BTU 4 burners and only have one pressure switch -.75 PF. I don’t turn my thermostat any higher than 58 in my house ya I know that’s cold but I don’t think I have ever heard my furnace kick into the 2nd stage hope I get a longer life out of the heat exchanger? I heard by early 2023 they will phase out 80% furnaces thinking of buying another one for the future don’t like the 90% and greater furnaces at all.

[onlywenilaugh]

Thanks for explaining. More to go wrong on the heart of the home. I like single stage 80% furnaces. May gas bill is about $55 a month so 20% savings if I were to get that from two stage, would take quite a while to make up for the added cost and repair bills. Just my opinion.

[karastom]

Thanks so much I did learn a lot from you
Is 2 stages require 2 pvc pipe also is really save you money and is there parts way too much expensive

[hchehrehnegar]

Great video.the guy is very knowledgeable.

[damian]

awesome vids, thanks form argentina buenos aires.

[dennysmith]

Increasingly, I see HVACers recommending the ol' 80 furnace, due primarily due to much less service costs over its lifetime vs the >90 efficient furnaces. In essence, over a 20 year life, the argument is that the ROI doesn't work out for 90's, but do work out for the 80's. Can you offer your experience to this? Thanks for all that you do.

[Jon-hxpe]

2-stage does not save fuel, it burns less gas over a longer period of time. It's for comfort.
Technically the steady state efficiency can be a little lower on low fire but that's offset by fewer on/off cycles so it's a wash.


You mentioned a 10 minute time delay - if you value your customers, sell them 2-stage thermostats so high is only brought on when it's needed and there's the ability to drop back down to low fire. The whole idea is to get continuous operation in very cold weather.