This article shares the issues related to finding the unit that best fits the size of your room.
The below chart is a good reference to see the minimum and maximum BTU of a room. As every room is different due to layout, insulation values of the walls, how many windows there are, and which direction the room faces the sun, the minimum and max can paint a picture if the customer is dramatically over or under-sizing.
Issues when running an oversized PTAC or AC in a room when heating:
- When the room heats up too quickly causing it to cycle on and off frequently. This results in uneven heating with some areas of the room feeling warm while others remain too cool.
- This may lead to premature wear and tear due to the extra short cycles as a result of rapid heating. This can result in increased maintenance and repair costs over time. This also decreases the lifespan and increases the need to replace the unit sooner than expected.
- The unit is not able to run for long enough to dehumidify the air adequately. This may lead to excess indoor humidity and may contribute to mold and mildew growth.
- The oversized PTAC unit is not operating within its optimal efficiency range. This results in wasted energy and increased greenhouse gas emissions, contributing to environmental concerns.
ir gaps or insulation issues should be addressed as this would be costing the customer heavily on their electrical bills.