Replacing humidifier in a crawl space. The crawl space consists of a dirt floor covered with sheets of plastic, and about 3.5 ft high and about 800 sq ft. There are no vents to the outside so it's sealed from outside air. The temp is about low 70's. The crawl contains the mechanicals, furnace and water heater. I run a blower to move air 24/7. The first humidifier I installed was a Frigidaire 50 pt. I connected a hose for continuous draining into a condensate pump. I set the humidity level at 40%. After about four days the unit never got below 75%. I thought maybe it wasn't working so I disconnected the discharge hose to allow the unit to drain into the bucket. Not a drop of water. So, I figured I bought a bad unit and replaced it with a GE 50pt. Basically the same thing happened with the GE. The GE appeared to generate some water through the discharge hose, initially but I don't think lasted very long. Both units are rated to run in temps as low as 41 deg. and there is no obstruction to air flow. Before throwing out the Frigidaire, I ran it in my garage, where the temps were in the 80's with high humidity. I found water in the bucket just after several hours, so the unit appears to be good. I don't know what to do to at this point and would appreciate any advice.

I just found out that i can help my poor ac by buying dehumidifier. I have 1200sq ft. My townhouse has basement but ut is always cool and i barely use it because it is storage not living area. We live mainly in living room and kitchen because 2 bedrooms upstairs are always too hot too humid. Our ac cant cool down house too good. Ac is set to 74F and it barely stops working. Electricity bill is high now $150. So if it is really true that dehimidifier would take away himidity then ac could faster and economically cool down house then i would be extremally happy. I found dehumidifiers in costco for $200. 40 Pint, For Rooms up to 2500 Sq Ft, Energy Star Rated Is this something good for me? Should i buy more expensive units? How many pints? Sq ft same as my house or much bigger? Where should i put it? In living room? In basement? Upstairs? Please advise...