Divide the result by 1,000 to convert watts to kilowatts. So for example, if your large window fan is rated at 250 watts and you use it 5 hours a day, its kWh use per day is 250 (watts) * 5 (hours used per day) / 1,000 (to change watts into kilowatts) = 1.25 kWh per day.o continue the earlier example of the window fan, if energy costs 17 cents/kWh in your area, running the fan as estimated earlier for one year will cost you approximately 1.25 (kWh per day) * 365 (days--the time period) * .17 (cost of energy/kWh) = about $77.56 per year if you use the fan every day.
THHN vs THWN Wire. THHN Wire is a type of electrical wire most commonly used in conduit and cable trays for services, feeders and branch circuits in commercial applications. It can be used outdoors because it's water, gas and solvent resistant thanks to its PVC/Nylon insulation.HHN Dual Rating. 1  All of our THHN electrical wire is dual rated with THWN wire because they're manufactured very similar with almost no cost difference. 2  It's the most standard type of electrical wire on the market because it's used as a single condutor electrical wire and also used in most electrical cables as well.
Southwire Type THHN or THWN-2* conductors are primarily used in conduit and cable trays for services, feeders, and branch circuits in commercial or industrial applications as specified in the 2008 National Electrical Code. When used as Type THHN, or T90 Nylon conductor is suitable for use in dry locations at temperatures not to exceed 90 C. When used as Type THWN-2* or TWN75, conductor is suitable for use in wet or dry locations at temperatures not to exceed 90 C or not to exceed 75 C when exposed to oil or coolant.