How to choose window fans to cool and dehumidify multi room 300 sq ft condo without air conditioning?

[pane-rubrics]

Is it possible to use window fans only for dehumidification and cooling 300 square feet condominium ?

 

[Baluncore]

Welcome to PF.

What is the external temperature range and relative humidity?
What temperature range will you accept inside?

 

[russ_watters]

The short answer is with fans and a window you can get the conditions inside close to those outside.

 

[AlexB23]

Is it possible to use window fans only for dehumidification and cooling 300 square feet condominium ?

It may not be possible if the humidity and temp outside is the same or higher as the humidity or temp inside. A small dehumidifier might be the best solution on high humidity days.

I would recommend setting the dehumidifier at 50%, to reduce the humidity, but also use less electricity.

 

[Tom.G]

For a portable or floor model, be aware that all the electricity it uses ends up as heat within the apartment.

If that would be a problem for you, I recommend either a window or portable air conditioner. The dehumidifier and and air conditioner use exactly the same technology, it's just that the air conditioner dumps the waste heat outdoors instead of in your living quarters.

I live quite close to the Pacific Ocean in Southern California. With central heat & air conditioning - and a portable dehumidifier, - there are always a few days in the summer when both A/C and the dehumidifier are needed.

Also, depending on the room layouts, you might need a box fan to get conditioned air into one of the rooms. With 300 sq.ft. the Low speed of the box fan would likely do the job.

Cheers,
Tom

 

[pane-rubrics]

Welcome to PF.

What is the external temperature range and relative humidity?
What temperature range will you accept inside?

Thanks I am more concerned about nights.
Expected outdoors environment in 21st century
1. Highest 28 degree C, Minimum 12 degree C , maybe 83% humidity
Indoor preferably 23 degree C

 

[pane-rubrics]

For a portable or floor model, be aware that all the electricity it uses ends up as heat within the apartment.

If that would be a problem for you, I recommend either a window or portable air conditioner. The dehumidifier and and air conditioner use exactly the same technology, it's just that the air conditioner dumps the waste heat outdoors instead of in your living quarters.

I live quite close to the Pacific Ocean in Southern California. With central heat & air conditioning - and a portable dehumidifier, - there are always a few days in the summer when both A/C and the dehumidifier are needed.

Also, depending on the room layouts, you might need a box fan to get conditioned air into one of the rooms. With 300 sq.ft. the Low speed of the box fan would likely do the job.

Cheers,
Tom

Thanks. I believe some type of fans are more effective like ceiling fans and dehumidifier is more environmentally friendly.
I am hoping to draw air at cooler side of condo and exhaust them at hotter side of condo.

 

[Tom.G]

Thanks. I believe some type of fans are more effective like ceiling fans and dehumidifier is more environmentally friendly.
I am hoping to draw air at cooler side of condo and exhaust them at hotter side of condo.

That of course will work if the outdoor temperature on your 'cooler' side is below your desired temperature.

If the 'hot' side of your condo is hot because of Sun shining in through windows, adding some solar-reflective film on the glass will certainly improve, but not correct the situation.

Another trick with fans is to run them full speed at night, pushing cooler night air through the rooms and cooling the walls and contents.

Cheers,
Tom

 

[Baluncore]

1. Highest 28 degree C, Minimum 12 degree C , maybe 83% humidity
Indoor preferably 23 degree C

Those numbers are similar to my summer temperatures. So I do not need, or have A/C.

I prefer the cold overnight, so I open the house and cool it, by blowing air through insect screens. In the morning, I close up the house, then cruise through the day on the cooled internal thermal mass. The time for transition is based on the difference between internal and external temperatures.

There may be a few days of heatwave, when I get 40°C outside in the afternoon, but the house inside, still remains below 30°C during those days. Those days seem to be less often than a decade ago.

The problem with humidity is human transpiration in a closed space. That is vented during the open house overnight. In winter, I will often open the house for an hour or more in the afternoon.

Hot water in bathroom and kitchen generate higher humidity, moisture that I remove with an extractor fan during the day, before it can condense.

One important thing is not having the house too cold in summer, or too hot in winter, so I do not have to change clothing before going in or out. That also reduces the cost and quantity of the insulation required.