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  1. Replies
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    If you REALLY want to get a handle on energy use...

    If you REALLY want to get a handle on energy use select the correct SIZE of equipment. Silly rules like "500sqft per ton" have to go. Reverse engineering of load calcs that happen to spit out about...
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    720hrs in a month. If the system isn't oversized...

    720hrs in a month. If the system isn't oversized and runs 1/3 of the time that's 240hrs. If the ECM saves 100W that's 24KWH/mo. 10 cents per KWH is $2.40 difference per month. Buys a hot dog and soda...
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    I've seen lots of apartment Firstco style ceiling...

    I've seen lots of apartment Firstco style ceiling air handlers. Many are the originals from the 80's, the condenser gets swapped with R22 dry units every time. End the production of R22 dry units...
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    Was the coil/blower wheel clean? What was the...

    Was the coil/blower wheel clean? What was the rated amps of the motor?
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    2 things I see going on: 1: No improvement of...

    2 things I see going on:

    1: No improvement of EER for a 2 stage system vs. single stage, yet the system costs twice as much. Hence the reason I didn't buy one. Sales EER increases due to running a...
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    Raw deal for those who worked their whole life,...

    Raw deal for those who worked their whole life, yet millions get a check when there isn't much wrong with them. It's all about hitting the "magic 50" where you get a free pass.
    ...
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    he's my favorite out of the current picks.

    he's my favorite out of the current picks.
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    1CPH? Really? Most thermostats are set up for...

    1CPH? Really? Most thermostats are set up for closer to 4CPH. oversized units will cycle more often than correctly sized units. It takes 7-10 minutes for a system to stabilize and reach it's rated...
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    I don't know how significant the 410a loss of...

    I don't know how significant the 410a loss of efficiency is in the real world.. My old AC was a 1999 12SEER R22/Piston, new is a 2009 14SEER 410a/TXV. KWH use went down by about 1/4. Went from a 3...
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    If the EPA is really worried about overall energy...

    If the EPA is really worried about overall energy use/grid demand they should limit WATTAGE of the condenser relative to sqft. Each region could have a limit on how much watts per sqft, this would...
  11. Switching a fixed orifice for a TXV can help in...

    Switching a fixed orifice for a TXV can help in some cases, it will allow the full surface of the evaporator to work during low load conditions.

    Here are some other tricks:...
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    Seems like they put a LOT into the "sales EER"....

    Seems like they put a LOT into the "sales EER". Have you thought about charge level vs. Sales EER? Charging procedure could be optimized to increase sales EER, but loose real EER. With a typical...
  13. FWIW I have a 44k furnace in my 1600sqft house....

    FWIW I have a 44k furnace in my 1600sqft house. Was still cycling when it was 5 degrees outdoors last winter. My house is a LOT newer though, 1999 construction. Unless your house is really leaky an...
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    14-16 SEER is worth buying IMHO, you do actually...

    14-16 SEER is worth buying IMHO, you do actually get a bigger outdoor coil and TXV. Once you go beyond 16 SEER sales EER takes over with silly hat tricks that don't save the homeowner on their power...
  15. 100,000BTU is a LOT of heat loss on a 1800sqft...

    100,000BTU is a LOT of heat loss on a 1800sqft house. Think about how much heat the furnace is pumping out and that ALL of it is leaking to the outside. Is it better to install a giant furnace or fix...
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    3.5 tons for 1700sqft sounds like '500sqft per...

    3.5 tons for 1700sqft sounds like '500sqft per ton' sizing. The 4 ton quotes are based on the averaging of the 5ton condenser with 3 ton furnace blower.
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    ECM's also have value for real energy savings...

    ECM's also have value for real energy savings when used with smaller systems. A furnace with a "3 ton blower" (the smallest you can buy from many manufacturers) installed with a 2 ton condenser will...
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    To get the rated SEER requires a certain air...

    To get the rated SEER requires a certain air handler and tonnage to begin with which rarely happens. The "up to" tonnage is typically awarded to the smaller units (under 3 ton) which are rarely...
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    1400CFM ton at 0.3" static? I'd like to see that...

    1400CFM ton at 0.3" static? I'd like to see that outside of lab conditions!! The factory default "green tap" is more appropriate for real world conditions, that's why it ships as such. Customer will...
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    Most systems don't deliver the full 400CFM/ton...

    Most systems don't deliver the full 400CFM/ton with either motor due to ductwork issues. Dumping the multi speed PSC and going with a single high speed would get PSC efficiency closer to that of an...
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    A too large duct system is a rare find indeed......

    A too large duct system is a rare find indeed... At what static pressure would you consider a duct system too large?
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    Depends on how bad the ductwork actually is. If...

    Depends on how bad the ductwork actually is. If ductwork is tight but can only deliver 800CFM at a reasonable static pressure, swapping a 3ton out with a 2ton may be a good solution if the customer...
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    If a customer can't/doesn't want to fix the...

    If a customer can't/doesn't want to fix the ductwork why not install a smaller system? It's not like the larger system will deliver it's rated capacity anyway..
  24. Think about all the failed heat exchangers you...

    Think about all the failed heat exchangers you have seen in the field. How many are 4 or more burners? How many 3 burners? Have you ever seen a 2 burner with a bad heat exchanger?

    90%+ furnaces...
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    I have yet to find a study that proves/disproves...

    I have yet to find a study that proves/disproves the east/west energy difference. East/West placement is NOT the same as simply shading the condenser. The air temp of a thermometer shielded from...
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