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  1. #14
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    Let us know what they say and come up with.

    And keep in mind, that just increasing return isn't enough to go from a 4 ton unit to a 5 ton unit, and get the full 5 ton capacity.

    Its very well possible that your current duct system is under sized enough that your aren't getting the full 4 ton capacity from it.

    They should be checking the static presure of your duct system also.
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    How many times must one fix something before it is fixed?

  2. #15
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,619
    if you want your house at 75° on a 100°day you should think about a 2 speed or 2 step unit because of the amount of 100°days compared to the amount of 85°to 95°days

  3. #16
    One other question while I'm getting quotes. 13vs14vs16 seer units. Looking at the documentation from Lennox, it appears a 13seer vs 16 seer would save me $500 over 5 years on a 3ton 1,600 cooling hours estimate. If I have two units, that would be 1K. So if a 16 seer costs 63% more, I question whether it would be worthwhile to make that investment as that additional cost would take a long time to pay for it. Any advice is appreciated.

  4. #17
    Guys, just a status update. I also need help deciding on a 14 seer with variable speed furnace vs regular furnace. We plan on staying in this house 10 years or more. I also need help deciding on a 4" Honeywell passive media filter vs a 1" filter. I have been told by various HVAC people coming out the drops associated with the 4" filter do not make it worth it. The reason I want the 4" filter is I had allergy problems in the past which were resolved by it. I just wanted the goods/bads on the filter choice.

    The original company I questioned his calculations. He totally admitted he made a mistake and redid the calcs and came up to a 4ton unti vs 5ton. The other 2 companies came in at the same. 2 tons upstairs and 4 tons downstairs. All three companies performed manual J calculations. All three companies state we need more return air flow for both units as we do not have enought. I will also say I had over a dozen companies come out and only 3 did the items listed here to help determine a hVAC contractor. I just find that very concerning.

    All three companies are about the same price range. One is offering Trane, the other Lennox, and the third Amana. I'm comparing 14seer units with 2 stage furnaces.

    The company I originally called I have had them do work before. I am comfortable with them and they did a good job on my other house with repairs.

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    The media filter is worth while. The duct may need alteration to have proper air flow.
    2 stage will provide better comfort, not great operating savings.
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    How many times must one fix something before it is fixed?

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