wait, what are the dimensions of the room about? 4k in a room that size seems small. You'd need at least a 5000btu unit which is about 100$, I'm thinking possible 10k btu cause 4k of lighting throws off a lot of heat and will only get hotter in there as the plants get bigger.
24,000 to 30,000 will cover it
my monthly is $430 I run 3 open 1000 watts in a sealed room with c02. 1 plant covers the electric. I didn't skimp on the a/c and got a top name brand at wholesale because i am a hvac contractor, it was $1800 you can get the china ones for 600 to $1200
Do you think I could get by with the 18000 BTUs?
I run a perpetual, I average 3-4 zips a plant depending on strain. I use 5 gal pots with pro-mix,worm castings and growstones. Last run i used jack's 20-20-20 start to finish, i am going to use Dyna-gro foliage pro start to finish this time to see the result difference.
Depends on what temps you want to keep your room. That is a little small, so it may not get as cool as you want and will run the whole time the lights are on to maintain a decent temp.
not a fan of posting pics. With the C.I.A running facebook and all, Don't give em any ammo,lol