Re: How many CHEs to use...
To add to Keosha's advice, it also depends on what temperature your house is usually - if it's colder, you might need two smaller CHE lamps, or you might need a 150 watt one. If it's not too cold, you can probably get away with a 100 watt. If you're not sure, I'd say go with the 150 watt unless you know you'll be able to easily exchange the bulb if you need to. It can also help hold in heat if you weave fabric or plastic into the bars on the lower part of the cage - a number of people with FNs have done that.
~*~*~ Kelsey ~*~*~
RIP my sweet Lily ~ 6/12/08 - 1/20/12