I have an ashley ap5710 that seems to act like it is on setting 2. The rate of feed is aurgar 2 seconds on off for 7 seconds.whitch gives a feed rate of 5 .To 6 hours on 20. Pound hopper i would like to have it last 8 to ten hous. Since at this rate my house is too warm . 75 to 80 degrees . any ideas on how to slow the rate of feed?manual says that on low it should last about 13 hrs