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Humidifier vs. Dehumidifier: Do You Need Both?

  Humidifier vs. Dehumidifier: Do You Need Both? Most people don’t need both a humidifier and a dehumidifier running all the time. In most homes, you only need the device that corrects the current problem: either elevated moisture (dehumidification) or overly dry air (humidification). The key is measuring indoor humidity and matching the fix to real conditions.   Indoor humidity is typically measured as relative humidity (RH). Many indoor air-quality guidelines recommend maintaining RH around 30%–50% . When humidity drifts outside that range, comfort and air quality can suffer—and so can the building materials in some cases.   When you need a dehumidifier   If your home is consistently humid—often in warm, wet seasons or in basements and ground floors—a dehumidifier may be the right tool. High RH can create an environment where mold, dust mites, and musty odors thrive, and it can also make indoor air feel ... Read more »
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Tankless Water Heater Sizing: How Many GPM Do You Need?

 Tankless Water Heater Sizing: How Many GPM Do You Need?


Tankless Water Heater Sizing: How Many GPM Do You Need?

Tankless water heaters don’t store hot water like traditional tanks. Instead, they heat water on demand, so the key sizing metric is how much hot water the system can deliver—measured in gallons per minute (GPM). If you pick too small a unit, you may notice lukewarm water or reduced flow when multiple fixtures run at once.

 

To size a tankless heater correctly, you need two things: your expected hot-water demand (how many fixtures are running and for how long) and the temperature rise (how much hotter the water must be heated compared with your incoming supply).

 

1) Start with your temperature rise

 

Temperature rise is the difference between your desired outlet temperature and your incoming water temperature. A common target for showers and dishwashing is ~120°F (to reduce scald risk). If your incoming water is, for example, 55°F ... Read more »

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