It's Not Rocket Science, But It is SCIENCE
with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE
Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities
It ain't happening man. Austin is the only one locally that requires any of this. Austin has Austin Energy which is the electrical provider. It also provides electricity to other areas with Austin addresses but not really in Austin. Texas is weird. They don't require any of this either. Some don't even require permitting for changeouts, but they do for new construction, which is little more than a money grab. An inspector in one of these areas mechanical inspection was poking his head in the attic to make sure we actually installed a furnace and coil per the permit. Nothing else, he didn't crawl into the attic at all. I did a job about 2 months ago, it was an add on to a house in no man's land between Austin and Round Rock. It was MUD controlled. No inspection or permitting required unless you touch the water line. At any rate, the guy paid somebody to install furnace, coil, condenser, ductwork for said addition. The guy installed a used, aged, gutted gas furnace, layed on it's side, no flue, no gas run to it. They did some monkey business to get the blower to run, all controls and safeties ripped out. Needless to say it was irrepairable. I installed new system and brought to code as much as humanly possible with what I had access too. I did another job about a month ago, not too far from this first abortion. Homeowner adding on to his house, doing work himself. I just added ducts to addition, did to Austin code since most restrictive. Once again, no permits, inspection, etc.... For me its good, I do things correctly, not much into cutting corners, no hassle with over zealous inspectors. But its also bad, cause I get called in to fixed some FUS sometimes. I've seen some really bad jobs that would make wall of shame look like wall of pride.
Originally Posted by dan sw fl
I like DIY'ers. They pay better to fix.
These efficient homes need fresh air to purge the indoor pollutants and renew oxygen.
Originally Posted by cdlgolf
2,800 sqft of air tight home needs a fresh air change every 4-5 hours when occupied. This is about 80 cfm of fresh air. How? You have cloths drier, kitchen hood, and bath fans that need make-up air to exhaust air. How?
You are rightfully concerned about maintaining <50%RH during the low/no cooling loads with high outdoor dew points. Also consider that the occupants in a home add 1-2 lbs. of moisture per hour. There will be days that you have 2-4 lbs. of moisture in the home and no cooling load.
The simple solution would be a whole house ventilating dehumidifier. Units like the Ultra-Aire 105 H provide fresh air when the home is occupied and will maintain <50%RH during damp times of the year.
This is the most efficient Energy star rate dehu available.
Ultra-Aire is co-sponsor of this site.
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"