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  1. Replies
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    A furnace blower moves X amount of air. The...

    A furnace blower moves X amount of air. The filter rack is basically the size of the opening on a (small) furnace. Sidebar: I'm only talking about your set-up, not to get too confusing. Larger...
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    If you're not get a high efficiency 'box' filter,...

    If you're not get a high efficiency 'box' filter, then make sure they use a new 16"x25" 'drop' and filter rack. If a 20"x25" 'drop' is available, that would be better. But a 16"x25" is fine for a...
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    708

    Regarding the filter size they are offering; it's...

    Regarding the filter size they are offering; it's 20% smaller than any furnace manufacture recommends. The contractor is using a less expensive 'drop' that has the smaller filter.

    There is a...
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    It would be nice if you could read his writing. ...

    It would be nice if you could read his writing. I love those preform proposals. Nothing said about labor, permit or taxes. I guess you have to trust them. I do not like the 16"x20" filter one...
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    If you have only one return for a 4 ton, it has...

    If you have only one return for a 4 ton, it has to be huge (or should be). When the other 2 HVAC guys recommended the 5 ton system, were they also going to change the return air duct and grille?
    ...
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    I agree with kcdean. People don't take into...

    I agree with kcdean. People don't take into account the dehumidification aspect of air conditioning. If you let all of the 'mass' absorb the heat and humidity, it takes a very long time to get back...
  7. I agree with 2old2rock. The existing sizes sound...

    I agree with 2old2rock. The existing sizes sound correct. There could be other issues as to why the furnace doesn't heat or the A/C doesn't cool.

    I agree that the higher SEER isn't needed for...
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    At 1,366 sq. ft., the 2 ton would be my...

    At 1,366 sq. ft., the 2 ton would be my recommendation. Having the A/C oversized will never cool the 2nd floor.


    There are other ways to make the home cool (more efficient) if the 2 ton didn't...
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    A 1,500 sq. ft. 2-story home, with proper attic...

    A 1,500 sq. ft. 2-story home, with proper attic insulation, attic ventilation and the right reduction of sun exposure should be able to cool with a 2 ton. To get the 16 SEER you need the...
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    One reason you can't cool the 2nd floor is...

    One reason you can't cool the 2nd floor is because a 3 ton is too large for you home. It is not running long enough to get the air there, plus it doesn't dehumidify. This will only get worse with a...
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    For the difference in the cost, I'd go with the...

    For the difference in the cost, I'd go with the 2.5 ton and turn the stat down 1-2 additional degrees. The verdict is still out as to the style of home. If it's a 2-story, a 2 ton will probably do...
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    I agree, if properly sized. But a 3 ton unit for...

    I agree, if properly sized. But a 3 ton unit for 1,500 sq. ft.?
  13. Replies
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    708

    Is your home a ranch or a 2 story? Forget the...

    Is your home a ranch or a 2 story? Forget the 2-stage A/C, for sure.
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    Yes, I understand your thinking. When you say...

    Yes, I understand your thinking. When you say you have 5 returns, are you counting the 4"x30" as one RA or two? How many returns are on each floor?
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    I agree with B.L. to have a 4-5" box filter...

    I agree with B.L. to have a 4-5" box filter installed. Also, have the humidifier installed (you'll need it) at the same time to save money. Make sure to get a humidifier that comes with a outdoor...
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    If the rooms can be closed from the rest of the...

    If the rooms can be closed from the rest of the house then returns to those rooms are needed.

    In the 'old' days they would put volume dampers in the returns as well as the supplies. You can...
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    They'll set the thermostat to make sure it...

    They'll set the thermostat to make sure it starts. If it starts, they'll hand you the bill.
  18. Thread: Short Cycling

    by George2
    Replies
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    987

    If comfort is the measure, a system that short...

    If comfort is the measure, a system that short cycles has to use more energy, period. A system that short cycles will cool, but not dehumidify.
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    They went back to all aluminum coils? The old...

    They went back to all aluminum coils? The old slope coils, I believe the model # was 514, were all aluminum. If I remember right, they were reliable.
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    You are way, way too short on RA. You need to...

    You are way, way too short on RA. You need to get someone in the home to give you some correct information. If none of the contractors noticed the lack of RA, keep looking. If the air noise didn't...
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    In that case, if possible, go with the sidewall. ...

    In that case, if possible, go with the sidewall. It'll be much easier. Make sure to get the 'variable-speed' blower motor. Also ask for the tin plated coil.
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    Without a lay-out of your home, this is just a...

    Without a lay-out of your home, this is just a guess or suggestion to consider. I would use the 2nd floor supplies for returns, if none exist there.

    I would run a 'riser' duct from the furnace...
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    How 'inadequate' is the existing 35 year old, 3...

    How 'inadequate' is the existing 35 year old, 3 ton A/C? Air conditioners lose cooling capacity after so many years. For the contractors to suggest 4 ton or 5 ton A/C systems seems a bit extreme. ...
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    You have a very large furnace with a 5 ton (2,000...

    You have a very large furnace with a 5 ton (2,000 cfm) blower. It requires equally large ductwork. That explains the 'singing' returns and the failed blower motor.

    Does the venting go thru the...
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    The W/H and furnace do have some clearance...

    The W/H and furnace do have some clearance requirements, but otherwise it should be a snap.
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