SamNC001 wrote:
I am purchasing a house, and there is a sunroom-like room in it. It
is (in my opinion) more than a regular sunroom, as it is carpeted,
has real walls on it etc...

? Normally this is the meaning of sunroom, at least in older homes. The
1920s house I grew up in had a "sunroom" that simply had more windows
and could be closed off; otherwise it was completely normal.

anyway, i want to install a window A/C pump on it. However, the
windows are not the kind that slide up and down, and I would have to
take the window out and replace it which is a pain for someone who
knows nothing about fixing anything.

Do you mean the windows are fixed, or do you mean they open vertically
(a casement window)? They do make ACs that you can special-order that
will fit a vertically-oriented window.

my question is, aesthetics aside, can i put a window AC unit inside a
room? would it harm anything?

As noted, this is foolish; it would just heat the room. The heat
generated by the compressor must be exhausted in some fashion.

i know they make portable AC units,
but the only ones i have seen are 10000 BTW, for 400$, and all i need
is a $100 window 5-6000 BTU system.

Well, the portable AC with an exhaust pipe you can put in a window (and
surely you could fashion a way to do this, even with a piece of plywood
with a hole) is probably the easiest way to go here.

Other options include cutting an AC mounting hole through the exterior
wall, just going with old-style air circulation and a ceiling fan, etc.
Be sure you aren't limiting your choices unnecessarily; with proper
ventilation the room may be perfectly comfortable in most seasons.

Also be sure you consider window tinting or awnings to shield the
brightest sunlight.

finally, the room has a baseboard heat, but i am not sure if it
works. if it does not, and i can not fix that, how energy efficient
are space heaters? are there any options to heat that room, other
than to stick a duct in?

thanks for all your help!!