A year ago I had a 100K btu Tappan (Nordyne) O5LD low boy oil furnace installed. it replaced a 29 year old Magic Chef 100K. The old furnace on the coldest days ( -10 to -15 f) would burn about 50% of the time. It is my understanding a properly sized furnace should run almost 100 % of the time in the coldest weather, therefore the old unit was oversized. since the new install we have not had any really cold weather to put the new unit to the test.
Question, should I have an undersized nozzle put in when I have its 1 year service??? I am really happy with the new unit, quiet and it appears to be far efficent as my oil consumption is down.
Question 2. I have a manual thermostat which I turn off when I leave the house and turn on when I return. This gives me longer run times, which I understand should be more efficient. So far this season with outside temps in the mid 20's overnight the house drops from 67 to about 59. upon firing the burner in 1 hr of constant burn the temp is at 70. about 10 degrees / hour increase. should I continue to shut the furnace off and go for the longer burn time?
The house is in Southeastern Ma., 2400 sq ft. lots of glass. half of first floor is on a slab with a cold tile floor.
thanks for any suggestions and thoughts.
bernie
Question, should I have an undersized nozzle put in when I have its 1 year service??? I am really happy with the new unit, quiet and it appears to be far efficent as my oil consumption is down.
Question 2. I have a manual thermostat which I turn off when I leave the house and turn on when I return. This gives me longer run times, which I understand should be more efficient. So far this season with outside temps in the mid 20's overnight the house drops from 67 to about 59. upon firing the burner in 1 hr of constant burn the temp is at 70. about 10 degrees / hour increase. should I continue to shut the furnace off and go for the longer burn time?
The house is in Southeastern Ma., 2400 sq ft. lots of glass. half of first floor is on a slab with a cold tile floor.
thanks for any suggestions and thoughts.
bernie