These are both discovered by using troubleshooting tools. There are four tools that prove to be very effective in analyzing naturally ventilated systems. The thermometer is useful in determining the temperature fluctuation occurring in the building. This is especially important during periods of operator absence such as night time. Avoid thermometers that have a detachable magnet to reset the temperatures.
Detachable magnets tend to end up in the manure pit.
Push-button resets are best. Properly ventilated buildings should have a relative humidity of 50 to 70 percent. The best tool to use for relative humidity measurement is a sling psychrometer. These have two thermometers, one with a sock that is moistened and the other left bare. Simpler, although less accurate instruments are available.