"I think you might be inferring too much from this...
Basically all I do is compare pre and post retrofit energy bills (nearly always just electricity) on a same month basis, adjust for climate if degree days are way off."
"...because you track, right?
Oh man I love hearing that. This exists SOMEWHERE on the resi level!!
A huge opportunity is being missed where I live because process ends at test out. My tracking was curiousity driven, not grant driven, so it's…"
"Yes and yes
Many of our audits and retrofits have been under the aegis of a local community-owned utility which got a grant to partly subsidize these efforts. The grant has expired, but cooperation continues.
I insist on a starting with a…"
"The electricity utility obligingly reads the meter and mails out a summary every month...
Seriously, we compare same months in year before upgrades occur, adjusted for degree days
If something doesn't mesh, I'll install a TED energy…"
"Don't assume that since the compressor remains at the same speed in low stage that it continues to consume the same power. The refrigerant bypass port solenoid serves to unload the compressor, and its amps fall proportionally to capacity,…"
"The humidity in Oklahoma isn't too bad most of the time, no need to design for high humidity. I can see where a 2 stage would be excellent for comfort in high humidity areas. Interesting that one model slows the fans while keeping compressor at…"
"We size for design temperature, in our case 94, and advise clients to "get a running start" by setting thermostat a few degrees lower on days forecast to near 100.
Around here, humidity control rules, and that is where two stage units…"
"The 2 stage is nice but I prefer to slightly undersize a single stage system. Most customers are OK with the A/C not keeping up once temperatures are over 95 outside, even though systems around here are typically able to handle 100-105 before…"
"I agree with most of that. The sweet spot for SEER is around 16, where the systems are two stage. I sometimes pick a slightly upsized air handler. The low stage really helps with efficiency as well as humidity control and noise.
"Don't forget the SEER/EER scam either. Selling customers ultra high SEER units that will supposedly save them big bucks on their power bill. Ain't gonna happen unless their old system was in bad shape. EER is the number that really matters…"
"Go ahead and add solar attic fans to the list. According to the manufactures they defy the laws of physics by getting 800CFM out of a 20W motor. with a 10" or 12" propeller. Odd that hardwired attic fans typically use 150W+ motors.The sick…"
"I would advocate for a 4th category shedding light on products and services routinely way oversold as to their conservation effectiveness / payback period. Examples which spring to mind:
1) Radiant barrier,particularly when rolled out on the attic…"
"Alex, a news station actually did the best test I've seen so far on residential power factor correction that we covered on Mapawatt. The problem with these hucksters is that it is pretty easy for them to use an amp meter to show potential…"
Open4Energy publishes lists of products that we believe make unreasonable claims in how they save consumers energy - which we define as "scams"The product fall into three categories: One; Power Factor Correction scams; Two; Renewable Energy scams and Three:…See More
Welcome to Home Energy Pros. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!
Don't forget to upload your profile photo. And add your location on our Member Map.
A presentation by Greg Labbé in April 2014 on retrofitting vintage home for energy efficiency. He talked about basic building science, brick houses, movement of heat energy and moisture in and out of the house, air barrier and water barrier, house…