I live in the city (one that does not allow chickens) yet I'd like to use a hot bed this spring. My neighbors, and my wife (and probably the local by-law enforcement) would not appreciate me bringing in a pile of manure. So I'll just try to use my regular compost (mostly kitchen scraps and yard waste) in place of manure, any special considerations? Special additives needed?
Yes to all the above . . . coffee grounds are wonderful, pee, grass clippings, etc. You'll need some browns if you are adding too many grass clippings as they'll start to stink if they're not mixed with some sawdust or shredded paper or dried leaves.
My addition to the list: comfrey. When I go around and harvest it all, I get about a cubic yard of comfrey leaves. Within 2 weeks, it's all gone --- it decomposes super fast. But it's a compost activator and his high in both nitrogen and water, which are necessary for the heat you desire.
"The rule of no realm is mine. But all worthy things that are in peril as the world now stands, these are my care. And for my part, I shall not wholly fail in my task if anything that passes through this night can still grow fairer or bear fruit and flower again in days to come. For I too am a steward. Did you not know?" Gandolf
I got this tall by not having enough crisco in my diet as a kid. This ad looks like it had plenty of shortening:
A rocket mass heater is the most sustainable way to heat a conventional home