I’m having a hard time locating a low pressure, low cost air pressure sensor to mount into my HVAC system. Without the sensor, I’m not comfortable going fully automatic with WHIA. Most of the sensors I’ve found either cost $800 US or require some pretty bizarre plumbing. I’ve thought about using an anemometer type setup inside the main line, but I’m not interested in flow rate as much as I am pressure. I’ve received some excellent suggestions from some very helpful folks on twitter, but I think I’m going to have to end up home brewing this one. My current theory is that if I cut a hole in the main duct (!) and mount a piece of flexible material over that hole, I should be able to measure the amount of deflection and make an estimate of the internal pressure based on that. I’m going to do more research because this makes my geek sense tingle, but that is at least an option.
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