Newbie incubator help needed re vent holes and temps

[Luke13:34]

I have a foam ice chest that I have made into an incubator. Just unsure as to where the vent holes should go - at the top? At the bottom? Both? When do you open the holes and when do they stay closed?

Also, I have a hot water heater thermostat, but there is a ten degree variation from when it comes on to when it shuts off. If I have it shut off at 101 degrees, it won't come back on until it dips down to 91 degrees. Is that OK?

 

[HorseFeatherz NV]

I have a foam Little Giant - not homemade

but the holes are in the top and bottom. Small holes in the bottom. The top has small and larger holes - one of the large holes has the fan attached to it. The other has a vent plug. Using the vent plug is kind of a personal trial and error type thing. In the past I never used the plug, but have recently found out if I use the plug during lockdown, my humidity stays steadier.


As for the temp difference - I think 10 degrees is too much but have never built an incubator before. How often does it cycle?

 

[rebelcowboysnb]

One vent high an one vent low on the same wall. About the size of a nickel each should work fine.

Read this page an watch the second video to help the temp issue.
http://cmfarm.us/WHTincubator.html