Question about Heating & Cooling
Posted by Anonymous on
I know this thread is a little old but I thought the question has still been left unanswered. Tonnage is assumed. But, CFM and BTUs are exact.
If anybody wants to know the true size of their a/c or heating system you need to go where the engineers go.
Consumers and contractors need to rethink their thinking when it comes to whole house heating and cooling... (Im from a hot humid area in the USA) Hot dry areas have other needs I won't.
ie... an air conditioner is no longer BTU's in a box. They have evolved into computers. computers that drive the blower motors, the expansion valves, the thermostat/controller can tell you the sub cooling, superheat, and the delta-t. Some tell you if the duct work is incorrect, static pressure against the blower. They are also not as forgiving if installed incorrectly.
Our industry is just catching on, but the consumer is untrustworthy when it comes to duct work and static pressure.
And in our high humidity market having high airflow with low static pressures removes far more humidity then a duct system installed over 10 years ago, Also, most homes lack proper return grille sizes, when the homeowner's desires are to put MERV 16 filters.
Here is a very useful link for duct and grille sizing.
Carry on my friends,
P.S. a neat little read,
Posted on Oct 24, 2016
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Posted on Jan 02, 2017
SOURCE: Carrier air handler tonnage?
That is a fairly large difference. It is usually ok to have the inside evap. coil and blower up to 1 ton larger than the outside condenser. That will make the unit slightly more efficient as well as less likely to freeze up on low airflow situations. It is not recommended to install a new condenser on an old evap coil. There has been a lot of changes to the design of the coils in the last little while. For example a 10 year old 2 ton coil may only have 3 cubic feet of volume but a new 2 ton coil may have 4 cubit feet of volume.
There are many factors that may have infulenced the decision on what size condenser to install. Many of which can only be done by visiting the home and doing alot of work, checking the duct sizing bioth supply and return, inspecting the insulation and windows of the home etc. etc. Most of the time that never gets done. You can blame the contractor for not doing a complete check, but at the same time you can blame the customer because many contractors that are that good loose the job to a cheaper bid that did not no any of the research. It is a catch 22 for everyone involved.
There is ALOT more to sizing equipment that many people think, sadly that also includes many HVAC contractors. Way too many people use "rule of thumbs" or flat out "guess".
Sorry for the rant but your queston can only be answered by a good well educated HVAC contractor visiting your home. That type of a contractor is getting hard to find these days in such a price competetive world.
Posted on Oct 14, 2008
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