Not enough air flow coming from the vents on the second floor.
I would like to increase the air flow on the second floor of this two story house as there is only a trickle of air coming through the vents. The temperature is a good 4°C to 5°C cooler in the upstairs rooms than on the ground floor level (this is in Mid January).
I have checked the round disc plate inside the ducting on all the vents and they are all fully open. I have checked the loft insulation and that appears more than adequate. I just don't think that the air flow coming from the furnace is enough to reach the upper level of the house.
I am a new owner of this 30 year old house and confused about the performance of the furnace which is a RUUD 90 PLUS ACHIEVER, it appears to be about 10 years old.
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Re: Not enough air flow coming from the vents on the...
If you feel like increasing your blower motor speed you can do this. Go to the air handler take the cover off to expose the blower motor. You will see a circuit board that has the blower motor wires going to it. Using your flash light look at the board and locate the terminals that read Cool Heat Park ... Now the Cool terminal should have black colored wire going to that one. Now locate the Heat terminal if it has red going to it and maybe blue sitting on the park terminal then swap the two around, blue is like med speed on the blower. Where Red is low speed. This will increase the blower about 50 rpms. You can even read your blower motor and get the speeds more detailed. You have a big house your unit is I bet a 4 ton A/C and 125,000 btu furnace. Probably has 1600 rpm motor. This is one solution. You have a up flow model and when you open the furnace cabinet up you will be able to see the specs. on the furnace. Let me know how that goes ken here in Kansas
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With a two story house you have to be aware that cold air flows downwards so any cold air coming from an ac unit will flow downstairs( normally down the stairway) so unless you can close off the down stairs then the up stairs unit will be cooling downstairs as well. Ac units have a thermostat located in the air intake and it cools until the cold air has risen to that point. In effect the space above the ac unit will be hotter than the floor. Knowing how they work ,you can see that the upstairs unit will never reach the set temperature because the cold air is continually heating from the house and will never get to the top thermostat.
So your solutions are
1-- fit controls that restrict the cold air from leaving the upper floor (Doors)
2--don't run the upper ac unit unless you are living up there (waste of money
)3 place an ac in each upper room and keep the room door closed
Sometimes it is difficult to keep your home cool in the hot summer months. Also, some areas of your home may still be hot where other areas are too cool. Try this method to keep your home cool evenly throughout. Before you get started make sure your furnace filter is new. This will allow for maximum air flow.
If your living space is a single floor plan:
Turn the air conditioning on
Switch the furnace fan from auto to on.
Measure the temperature in each room.
Close the vents by about half in the cooler rooms
This will force more cool air into the warmer rooms.
Keep adjusting the vents until all the rooms have the same temp.
If your living space is on more than one level:
Turn on the air conditioning.
Switch the furnace fan from auto to on.
On the lowest level of the house close half of the vents that are the closest to the stairs.
This will force more cool air to the top floor where it is usually hotter.
Cool air will sink from the upper floors which will keep the area near the stairs cool.
Measure the temperature in all the rooms.
Keep adjusting the vents until you have a nice even temperature throughout the house.
I found that leaving the furnace fan on all the time will keep your home evenly cool and comfortable. You may have to replace your furnace filter once a month due to the increased air flow. It will be well worth it in a cooler, more comfortable, and more energy efficient home.
It sounds like you got shafted and the guy installed a smaller air handler unit with a smaller motor to try to make more of a profit...
The problem is getting an unbiased opinion from someone who knows their stuff...sad to say but stuff like this happens all the time...
Here are a couple of tips that I wrote that may help you...
do you have floor or ceiling vents, and does your house have concrete flooring or do you have a crawl space under depending on the answer because if you have a unit that is all outside then the duct may not be sealed
Check your filter and make sure you have one in place and it is clean. This is either a low inside airflow problem or system is low on freon. If you have strong air flow from vents and filter is been kept clean then low freon is most likely. Run system in on position with cooling off to make sure ice is melted. When water stops draining. then restart system . If it starts frosting up at outside unit shortly after start up it most likely is air flow. If you don't have at least 15 degree drop from registers in a few minutes and indoor humidity is not too high inside and airflow decreases and air gets colder just before it freezes up then it is low freon.
A good heating guy should be able to balance your dampers to increase the airflow upstairs. Keep in mind heat rises. 2nd floors are the hardest to cool. You may need to add more returns to pull the heat down the the evaporator so it can be cooled. If you are lucky you may be able to adjust your blower up to a higher speed. You may have to even add some more supply airs. Check with your local building inspector. He may be able to give you a list of contractors in your area that would be good for this type of problem. Good luck>>>
Is this an up flow system,(vents in the ceiling) or down flow, (vents in the floor?) As always, theres a place to add filters , before the fan on the suction side! No telling how long this been running without the filter and already contaminate the freshair system.. This is supposes to be checked out by the building inspector before you buy any house,Just talk it over with the Realestate Agent , have the full system cleanned and send them the bill or talk to your big brother the BBB! Thank-you-very-much!
I would say that the floors are individually selectable, and maybe the control is not set for the top floor to come on. If it is, then most likely the fan unit is not working and should be tested.
First check the fan motor with the power off, then check the supply with the power on. ***** DANGER OF SHOCK ******
Only do this test if competent and have the correct tools and training.