Part of the issue is you have nothing that is basically correct (accurate) in your heating system.

The Hydrofarm has an 8 degree window. (+- 4 degrees). The Accurite thermometer is the same an 8 degree window. If you check the specs on you gun you are likely to find it has a 4 degree window (+\- 2 degrees)

It guns are great tools but they reflect and refract like all light does so they really can only be trusted with matte objects that are about the reflectance of brown paper. Measuring flexwatt may not give correct readings.

I believe every set up should have one tool, thermometer, thermostat that is accurate. A few years ago I would have said less than 1/2 a degree f. Now I go for one full degree a two degree window. Sadly a certified thermometer that has this accuracy is almost always more costly than a high end thermostat that is better than one degree accuracy. I don't think you have anything wrong other than you have nothing that you know is right and this makes everything suspect. A herpstat is about 100$ for the base one this is how I would proceed. A better t-stat that you can be certain if it says it is 90 it is 89-91 or better.


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