Just be cautious
I would also be very careful with using a UPS to power your furnace. With a typical UPS, unless you get a Smart UPS (which are very expensive), you risk damaging the electronics in newer furnaces. The controller board needs very clean AC power, of which a typical UPS will not provide.
The same is true for some portable generators. I had a coworker fry the controller board on his new Lennox furnace a couple years back because the Total Harmonic Distortion (i.e. distortion of the input voltage) was not sufficient.
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