Sizing dehumidifer to protect house and belongings
I was wondering if anyone has any practical experience in sizing a dehumidifier in an equatorial climate. Our open-plan house is on three floors and. An open staircase connects the following room sizes:
Basement: 270 square feet
Middle Floor Living Area: 750 square feet
Top Floor Living Area: 1210 square feet
The daytime RH is around 70-80% in the basement and can rise to over 90% at night. The RH in the connecting middle and top floors are between 5-10% and 10-15% less, respectively. The outdoor temperature at night is usually between 24°C (75°F) and 29°C (84°F)
I plan to install solar and upsize the rating to allow me more energy to play with. I will run one 1.5 HP split AC throughout the day. This will reduce the RH in the basement to 60-65%, which is almost acceptable.
I understand that the most cost-effective way of reducing the RH at night is to place a dehumidifier in the basement that will run through the night. The dehumidifier could also support the AC in the daytime. There is no ducting, so I need to use a portable model.
I am struggling to size this. I have checked a lot of websites, but the recommendations vary greatly. The two largest models are:
A 35 litre 350 watt
A 60 litre 780 watt
I prefer the 35-litre if possible as the 60-litre would cost a lot to run. Would it be enough to keep the RH at around 60%?
Any help would be greatly appreciated.
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