Furnace questions
#1
11-22-15, 05:40 PM
Furnace questions
I live in snow belt Ohio and last year we replaced our old 60% (1970) furnace with a more energy efficient 90% furnace. It runs great, comes on immediately and the blower motor does a good job of pushing the air. Only problem we are having is that the house feels cooler than it did with our older furnace.
We have checked the thermostat temperature readings with another thermometer and it is right on, but the house feels cooler and we have to run it at higher temperature settings to get the same "feeling" of warmth. So even though we are pleased with the mechanical operation of the furnace, we are at a loss to understand why it leaves us feeling cold, even when the thermometer says it is at the same temps we used to keep the old furnace at.
Any ideas...is it all in our heads? Brrrrr.
Sallie
We have checked the thermostat temperature readings with another thermometer and it is right on, but the house feels cooler and we have to run it at higher temperature settings to get the same "feeling" of warmth. So even though we are pleased with the mechanical operation of the furnace, we are at a loss to understand why it leaves us feeling cold, even when the thermometer says it is at the same temps we used to keep the old furnace at.
Any ideas...is it all in our heads? Brrrrr.
Sallie
#3
11-22-15, 07:10 PM
I don't know. The installer just gave us info on two furnaces...the 80% and the 90% along with the energy savings info for each. He was a professional who had fixed our old furnace several times during the years, so we just chose him to do the replacement.
#4
11-22-15, 07:16 PM
A good contractor will always do a manual J (load calculation). It could be under sized or oversized.
#5
11-22-15, 07:43 PM
Group Moderator
Usually an undersized furnace will struggle to keep up and run for long periods.
Does it feel like the same amount of air coming out of the registers ?
Does it feel like the same amount of air coming out of the registers ?
#6
11-22-15, 10:05 PM
Actually the furnace runs for a shorter time and the air coming out is really hot. And although the thermostat says 75 it feels like 68 or lower. I know I probably sound like I am crazy, but we'll have it set on 75 and will still be cold. The old furnace would be driving us out of the house if we ever set it at 75. I just don't get it???
Sallie
Sallie
#7
11-22-15, 10:28 PM
Group Moderator
The thermostat is usually put in a "representative" location so that when the air around it gets to temperature the rest of the house should be similar.
You set the thermostat at 75°.... using a separate thermometer..... is that room at 75 ?
Are the other rooms also at that temperature ?
Was the thermostat replaced ?
You set the thermostat at 75°.... using a separate thermometer..... is that room at 75 ?
Are the other rooms also at that temperature ?
Was the thermostat replaced ?
#8
11-23-15, 08:29 AM
Thermostat is new with furnace. It is one of those digital ones and it is placed right in the middle of the house on an inside wall of the living room. I have checked with other thermometers and the rest of the house is at the same temp, except for the upstairs which is always a couple degrees warmer due to the heat rising.
I have googled this problem and I find that it is quite common. (At least it not all in my head LOL) There is something about getting the right "output BTU's" for your home instead of looking only at the input. It has to be just the right size, not to small or too big, or you can run into this problem. I don't understand it all, but there's a problem somewhere.
Sallie
BTW...Thank you all for the responses!!
I have googled this problem and I find that it is quite common. (At least it not all in my head LOL) There is something about getting the right "output BTU's" for your home instead of looking only at the input. It has to be just the right size, not to small or too big, or you can run into this problem. I don't understand it all, but there's a problem somewhere.
Sallie
BTW...Thank you all for the responses!!
#10
11-23-15, 12:29 PM
I have a mid 80's furnace. The blower is multi-speed. The manual says to run it fast for A/C and slow for heat for best comfort. The speed is switch selectable. I would think a newer furnace and control would have this feature. Maybe the blower needs to run at a slower speed. Hope this helps.
#11
11-23-15, 03:27 PM
Banned. Rule And/Or Policy Violation
>
A new furnace often needs to be set up to work properly once it's installed.
For example, a furnace needs to have the fan speed properly set. If the speed is too fast, too much air flows past the heat exchanger and this dilutes the heat that get into the dwelling space.
The furnace heat rise should be measured and the fan speed set to a proper level. This may have been neglected.
Often circuit boards can be set to different settings that determine when the fan turns on and how long it runs after the gas is shut off.
I'd call the contractor that installed the furnace for you. They should send someone out to inspect and adjust the furnace as needed.
A new furnace often needs to be set up to work properly once it's installed.
For example, a furnace needs to have the fan speed properly set. If the speed is too fast, too much air flows past the heat exchanger and this dilutes the heat that get into the dwelling space.
The furnace heat rise should be measured and the fan speed set to a proper level. This may have been neglected.
Often circuit boards can be set to different settings that determine when the fan turns on and how long it runs after the gas is shut off.
I'd call the contractor that installed the furnace for you. They should send someone out to inspect and adjust the furnace as needed.
