Reviews:
 ·ProLog
 ·Verizon Online DSL
 ·voip.ms
| reply to Goober
Re: [Heating or Air Conditioning] Are these quotes reasonable? Did any of the replacement companies actually do a Manual J load calculation and a Manual D to verify the ducting size?
Don't assume the old unit was sized correctly as back in the day "bigger was better". Now for energy efficiency and comfort a heating and cooling system needs to be properly sized. This will help control humidity, ensure an even temperature and minimize operating costs.
5 Ton may be too big in this day and age of high efficiency units.
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The difference between genius and stupidity is that genius has its limits. |
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 cowboyroPremium
join:2000-10-11
Shelton, CT
 ·AT&T U-Verse
| said by pende_tim:5 Ton may be too big in this day and age of high efficiency units. Efficiency has nothing to do with it. Too small will not cool or would need to start at noon to make the house comfortable in the evening greatly negating any savings.
In this day of variable speed blowers a slightly oversized unit may be the better choice for comfort and savings. |
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Reviews:
·ProLog
·Verizon Online DSL
·voip.ms
| An ideally sized unit runs continuously. This is how efficiency is calculated on newer units: from steady state running. If it is over-sized and starts and stops a lot, the 16 SEER can quickly become a 13 SEER and all the extra money you spent for the higher efficiency is wasted.
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The difference between genius and stupidity is that genius has its limits. |
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 mattmagPremium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3 | said by pende_tim:An ideally sized unit runs continuously. You forgot to add "during the times of highest cooling demand". If its only 75 outside and your A/C unit is set to 70 and it runs continuously, you have a problem. 95 outside, different story---Yes, it should run much longer or near continuous. |
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| Yes, during highest demand conditions. |
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cowboyroPremium
join:2000-10-11
Shelton, CT Reviews:
·AT&T U-Verse
| reply to pende_tim
said by pende_tim:An ideally sized unit runs continuously. This is how efficiency is calculated on newer units: from steady state running. If it is over-sized and starts and stops a lot, Decent thermostats set a certain CPH rate. So 2 ton or 5 ton it would still run exactly the same number of times every hour as long as the setpoint can be reached. Not to mention that steady-state is reached in 30 seconds or so, making any efficiency loss irrelevant.
However if it needs to run all day then all the potential savings of a whole season are gone in 1 day.
I have done a ton of testing and real-life data acquisition to conclude that the difference is negligible. |
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