Is this furnace a good choice over a 90% condensing model?

Only if you want to avoid PVC venting and condensate drainage, or your existing flue and budget favor a like-for-like replacement. A condensing furnace cuts gas use noticeably but costs more to install and needs different venting.

What size home does 60,000 BTU heat?

Roughly a small to mid-size, well-insulated home in a moderate climate. Sizing depends on your home's heat loss, ductwork and climate, so have a contractor run a load calculation.

Can it be installed horizontally?

Yes. The cabinet is built for upflow or horizontal installation, which suits attics, crawlspaces and closets. A contractor confirms the orientation and venting for your space.

Does it work with a standard thermostat?

Yes. It is a single-stage furnace, so a conventional single-stage thermostat works. A smart thermostat also works but gains little, since the burner has only one stage.

What is included with the furnace?

The furnace unit itself. Venting, gas piping, the thermostat and any coil or plenum are separate, and installation is required by a licensed contractor.

How does it compare with Goodman's two-stage furnaces?

Two-stage models run at a lower output most of the time for quieter, steadier heat and better efficiency. This single-stage unit is simpler and less expensive to buy but cycles more.