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R Value Calculator

Before Heating/cooling off for at least 60 minutes Sun not shining on outside surface Ideally large inside/outside temperature difference Steps Measure temperature of an inside wall, bed head, funiture, ideally facing into room at same height as wall near the wall Measure the wall/floor/ceiling Measure outside air temp Calculator Surface Type: Wall Ceiling Floor Temperature Units: Celsius Fahrenheit Inside Ambient Temperature Inside Surface Temperature Outside Ambient Temperature Calculate Results Indoor Air Film Convection Transfer W/K/m2 Indoor Air Film Radiation Tansfter W/K/m2 Indoor Air Film R Value (SI) m2·K/W Indoor Air Film R Value (Imperial) ft2·°F·15/BTU Heat Loss (SI) Heat Loss (Imperial) Estimated R Value (SI) m2·K/W Estimated R Value (Imperial) ft2·°F·h/BTU
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Insulation: AC Air Intake Box

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  My air intake box has a little spray foam around it, however it doesn't look like much. I plan to insulate the box with at least R5 and I may add R2 around the ducts. Image 1 We can see from the image that I am losing heat.  Image 2 I estimated it's R Value to be around R0.1, which is terrible. It drops by roof from R5 to R3. As such I've put R5 around it.
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Calculating R-Value and Heat Loss Using FLIR ONE PRO And Surface Temperature

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Seeing all the missing insulation in my roof had me wondering if I could use my thermal camera to estimate heat loss. A quick google search found this smart guy's post  Measuring your house walls R-value with an infrared thermometer  with the calculations. The maths are beyond me, but lets see if I can figure it out. Temperature Gradient For a given internal ambient temperature and a given outdoor temperature the temperature drop for each different material is proportional to the materials R Rating.  e.g. 68F indoor to 8F outdoor is 60F delta T. The total R rating is 13+6=19. So the drop for the R-19 material will be 13/19*60 = 41F. Now what if we don't know one of the R Ratings but we do know the temperature drop? Indoor Air Film Air is a good insulator and the approximate indoor air film for stable air is R0.14 or U7.14. This is the air between your indoor wall and yourself. The U value is made up of radiation of around U5.1 and conduction/convection of around U1-3. A s...
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