On temperature:
Chemists [I'm one, btw] will tell you that there's a rule of thumb about temperature and chemical reactions. Reaction speeds will double for every increase of 10 degeees C.
Now, I'm not going to crunch numbers here nor dabble in arcane math. The truth of the matter, in simple terms, is that winter room temperatures of about 68-70 degrees F will work just fine if your solutions [primarily the developer -- stop baths and fixers are less fussy,] are at that temperature. However, in summer many parts of the US will reach temperatures of 90 degrees or more. Unless you've got your bottles of chemicals in a room cooled to 68-70 degrees, you could face overdevelopment [dark negatives of increased contrast] unless you compensated for the temperature with a reduction in developing time. [There are tables which do this.]
To boil this down further: film development's 'comfort zone' is around 68 degrees F. You can stray a degree or two either side without much of a problem. However, if your indoor temperatures are going to be outside that range -- get a thermometer and heat or cool your developer to bring it back to 68 degrees F [more or less.]