Ability to build facilities...
 

What are the factors in allowing large numbers of facilities. It isn't how large the planet is by itself and it doesn't seem to be affected by the environment. I build a climate control facility and it didn't seem to increase anything.

How do I tell before hand how many facilities a planet will support?

Re: Ability to build facilities...
 

# of facilites depends on two things:
1. Planet size
2. Whether the atmosphere is breathable for the colonists

Domed colonies have 1/5 the facilites of an undomed colony.

Plant Size/Domed/Undomed

Tiny/1/5
Small/2/10
Medium/3/15
Large/4/20
Huge/5/25

If a colony is domed, you can increase the number of available facilites through one of two ways:

1. Bring in people from a race that can breathe the atmosphere, and remove the old race.
2. Build an atmosphere converter and change the atmosphere to one the population can breathe.

I'm not certain, but I think Climate Control facilities only affect the conditions of a planet. The condition affects the population's reproduction rate but not much else.