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Is that an attached garage on the top side of your picture (near where there are vehicles parked)? If so, I'd say run a gas line to the attached garage for a heater there and then do the 50' run to the detached. If not, I'd lean towards option 1 (bury from meter to garage).

Most adjustable (not necessarily variable) speed blower motors are Permanent Split Capacitor (PSC) motors. https://en.wikipedia.org/wiki/AC_motor#Permanent-split_capacitor_motor There are some companies that make a variable speed drives for PSC for HVAC applications, but that might be more cost...

@Nivekdodge - what is connected to the other (non-floor) side of the heat exchanger? A boiler? Water heater?

I have a 6kW system on my house. It's nice running two A/Cs all summer and not having much of an electric bill. My only regret is that there wasn't enough roof space for more panels. 6kW solar doesn't quite match the 6kW electric boiler in the winter.

I've had decent success with Nest for the last 8 years or so. I think what gives Nest such a bad name is their claim that no "C" wire is required. From what I have read online and from the experiences of friends, this is very hit-or-miss (more miss). What drove me to the Nest is constantly...

Ask This Old House had an episode that installed a steam humidifier, the Aprilaire 865 that brewchief has mentioned.

How well does it work?