Advice...OK . DIY...NO WAY!
Originally Posted by mtamara
Please read the rules for posting.
How much insulation do you recommend?
Originally Posted by skippedover
Perhaps you should have read the instructions before calling.
You are correct on load design and Espi Tech offers this service both on line and in house. a real advantage however is the exact cftm is given for each run, so, IF, the contractor does the proper calculations the exact number of outlets per room are known.
I would imagine less than 5% of contractors really do proper load analysis. I have talked to many so called pros that oversize product to a great degree to cover thy butts.
That being said plumbers are looking for other ways to make it due to the DIY crowd and the Home Depot mentality. I mean really, Trane is selling in Home Depot and that in my mind no matter how it is done strikes all in the industry in the wrong way. It will not take long for similar retailers to buy a private label from desperate mfg. hire their own installers and bam, everyone is out. If we were all smart would stop buying Honeywell and anything sold directly or some how indirectly from our industry to the home owner direct. Plumbers will tell you it is a slippery slope indeed.
I am quite familiar with the Unico System (high-velocity, small-duct) and they offer both free load calculation and duct design services. Of course, their designs won't work for conventional systems, so only utilize if you are considering high velocity or it will just be a waste of your time and theirs.
Also, Unico's high velocity systems are rated different than conventional systems. Due to the difference in engineering, tradional SEER testing does not properly rate Hi-Velocity, Small-Duct systems and the Department of Energy has a different rating technique for high velocity. That rating document can be obtained from Dept of Energy or Unico's marketing department.
So the statement "Furthermore, the high velocity systems start out with a lower SEER rating and so are not as energy efficient to begin with" is misleading if you do not get all the information available and understand the different engineering aspects of conventional vs high velocity..
As I understand it Unico got away with the old design of the system and only 200 cfm/ton by claiming the lack of leakage, and really in my opinion a cop out. Velocity Plus has 300 cfm/ton and it does not leak either. With Unico you get approx 11 seer with a 13 seer cond unit. With Velocity Plus you get 13 with a 13. Apples for apples a better deal for all.
Originally Posted by Load-Calcs
try using mastic tape,or resendial mastic.this will get rid of your duct loss.try using r8 insulation
Originally Posted by hvaclover