Why Can't Comfort be Achieved at 75 degrees Fahrenheit? Discover the Secret to Ultimate Home Comfort!

Have you ever found yourself setting your thermostat to a lower temperature because you just couldn't seem to reach the perfect level of comfort at 75 degrees Fahrenheit? Many people operate their homes at low temperatures because at 75°F indoor temperature the humidity gets too high, they begin to perspire. They lower the thermostat a couple of degrees. For the next 30 to 40 minutes, they begin to feel more comfortable. However, after an hour and a half has past, they begin to perspire and the thermostat says its 73°F, so they lower it another couple of degrees. One issue people begin to notice in this scenario, once the cooling system brings the home down to the thermostat set point, the system seems to turn on and run for less than five minutes and turn off and may not come back on for as long as 15 minutes. This indicates that the cooling system is oversized. Oversized cooling systems tend to short cycle and are not able to pull humidity from the air, causing discomfort and reduced efficiency. In this blog post, we'll explore why comfort can't be achieved at 75 degrees Fahrenheit and uncover the secret to ultimate home comfort.

The most common reason why people can't find comfort at 75 degrees Fahrenheit is due to equipment oversizing. When HVAC equipment is over-sized, the runtime for normal operation during outdoor design conditions decreases, leading to an adverse effect on indoor comfort. Outdoor part-load takes place for thousands of hours per year, resulting in very short run time with no dehumidification creating discomfort for homeowners. According to ACCA (Air Conditioning Contractors of America) Manual-S, proper equipment sizing is essential to achieving optimal comfort in homes.

Oversized cooling systems tend to short cycle and, as mentioned earlier, are not able to pull humidity from the air. This is because the system cools the home down to thermostat set-point too quickly without removing the moisture, leading to high indoor humidity levels and eventual discomfort. With the right-sized system, the HVAC unit will deliver the right amount of cooling and dehumidification needed to maintain a comfortable indoor environment.

The goal of the HVAC system design practitioner is to design an HVAC system that is capable of evaporating the perspiration off a person’s body faster than their metabolism can produce it. This means that the system must be adequately sized to handle the specific load requirements of the home. If you can't find comfort at 75 degrees Fahrenheit, your home may require a Manual J load calculation to determine if the sizing is correct. This will help to determine the specific heating and cooling requirements of your home to ensure that your equipment is sized correctly.

Conclusion:

In conclusion, achieving optimal home comfort at 75 degrees Fahrenheit requires proper HVAC equipment sizing to ensure that the unit runs efficiently and maintains a comfortable indoor environment. Oversized equipment leads to short cycles, high indoor humidity levels, and eventual discomfort. Therefore, if you're having trouble achieving optimal comfort at 75 degrees Fahrenheit, consult with Calcs-Plus to perform a Manual J load calculation to determine if your equipment is sized correctly. Ultimately, the secret to ultimate home comfort is getting the right system for the job.