Central forced air heating is by far the most popular kind of Zone heating, also called zone control heating, is a system of dampers installed in the ductwork of your home. The dampers are basically large valves that can open and shut to direct air flow. A damper is installed at each room junction, effectively splitting the house into a number of isolated zones. A thermostat is installed in each room with a damper, allowing that room total control over the air flow into it.

Zone heating is often installed to remedy the two problems mentioned above. Normal central air heating is inaccurate in which rooms it heats, so zone heating isolates each room to allow precise control over their climates. Central air heating causes a lot of uneven hot and cold spots, due to its reliance on a single thermostat. Zone heating compensates for this by installing many thermostats, ensuring that each room can be set to the comfort level of whoever occupies it.

By solving these two issues, zone heating saves energy and makes the rooms in your home more comfortable to be in.

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This issue almost exclusively applies to instructions on how to safely repair it.

The average rated life of a light bulb represents how long it took for half of the bulbs to fail during testing (given perfect conditions). If your bulb lasted 12,315 hours (you counted!) but the label touted an average rated of life of 20,000 hours, you’re actually still within range of an acceptable life span.

We measure LED bulbs a bit differently since they never technically burn out, but rather fade over time. Instead, the Lighting FactsTM label indicates LED lumen maintenance (LM), which is an estimate of the bulb’s lumen depreciation over a given time.

Solution: Understand that the expected lifespan of your light bulb is simply an estimate based on testing that was performed in a controlled environment. When a bulb burns out earlier than that estimate, it doesn’t always mean something is wrong with it.