"It does make a difference where you are seeing the oily stuff. If humidity is very high, and there is any organic dust (skin particles, VOC's etc) that are carried in the air stream - its possible that the oily stuff is…"
"Questions to ask such that reasonable answers can be made:
1) Where do you live, urban or rural areas? Distance from town?
2) How much do you drive each day? Each week?
3) Are there lots of suitable charging stations available in…"
"For Steve Kramer,
Once a month bills - make it quite difficult to identify how the energy in the house is being used. For the gas bill - is the largest use for a hot water heater, the furnace or gas range? By making the data…"
"We know what the definition of "not going negative is..." but the definition of "good residential IAQ" has and continues to be a subjective definition. Even ASHRAE has danced around it. EPA (mostly for political…"
"Is the room insulated? Have you measured the temperature of the room during the heating season? With the furnace in the room, and the duct work coming into the room, my guess is that you've got a lot of heat loss into the room that would…"
"Are you sure it is a "25kW" system and not a "2.5kW" system. 25kW would be about 80 PV modules on the roof top (roughly), and perhaps five or six Xantrex inverters (5kW each). The majority of homes are 5kW or…"
"If the VOC and CO2 is coming from the basement floor drain... that's easy to test the hypothesis... move your Uhoo down next to the drain...because of the close proximity to the drain the gases would not have diffused as much and it should go…"
"There are a couple of important items in your post that started this thread.
First, you believe you already have an indoor air quality problem (excluding the radon issues).
Second, your wife is planning on having an art studio in…"
"Yup, I'm not sure you want to even try tightening up a modular home built before 1975. I think it's pretty risky. These were not homes designed to last fifty+ years. I've seen the fiberglass in those old walls…"
"You made some very important observations.
It's really important to think about how tight you air seal a modular home. Replacement air for combustion devices such as stoves, furnaces and hot water heaters depend on those leaks. Tighten up…"
"You didn't mention anything about the age of these homes. Early mobile/modular homes (1960's) sometimes had walls that were made with 2" thick walls, HVAC duct coupling between sides of a double wide - depended on the…"
"One of the issues with the jump in readings - may also be related to the instrument design and its sensors. If the CO2 reading is via an electrochemical sensor and not a nondispersive infrared sensor (NDIR), then its possible…"
"But he could use a Panasonic in the bedroom... Or the work area that he sits in all day.
Depending on the size of the house... the total continuous fresh air needs may only be 40cfm to 100cfm. It doesn't sound like he's…"
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