I agree. There may be need to replace a failing furnace but the real problem with replacing that furnace is the house is so bad you can't find one big enough. When she is spending $500 a month how can she afford not to fix the house? A new furnace probably won't lower that cost much.
Originally Posted by The Earl
I know you mentioned you are trying to help so maybe you could try to explain the economics to her and perhaps contact the local community action programs if available. There are quite a few resources available to help in these situations.
A 140,000 90% will output more BTU's then a 150,000 80%.
Is that ~ 170 Gallons propane per month?
Originally Posted by DGOHVAC
Beenthere points to the basics of better equipment selection in his last comment.
One can work the total BTUs required / furnace size backwards
and correlate with a Manual J calculation / temperature bin data to justify a
It seems that a higher efficiency, less huge furnace would be appropriate given your climate and propane costs.
It's Not Rocket Science, But It is SCIENCE
with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE
Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities