We tried this without the door for a couple of days and then added it. The cats began using it at once and cope fine with the door as well. There is less mess and smell. It's also easy to clean.
Nuaire Drimaster Eco HC *2016 MODEL PIV - 7 YEAR WARRANTY!*
We'd been battling serious condensation in several rooms. The windows were running every morning, the bathroom took hours to dry after showers, sometimes staying damp all day. There was also water on the cistern which dripped onto the floor. The result was mould, of course, and much time spent drying and cleaning. This was in spite of following all advice about heating and ventilation and attempting to reduce the condensation we produce.
The unit arrived promptly. We fitted it ourselves and it dramatically reduded the condensation problem in a few days. During very cold weather we get a few centimetres at the bottom of the bedroom and bathroom windows but this is 50 times better than before we had the unit. On milder days there is nothing and the bathroom dries after showers in an hour or so. We still ventilate as well as we can and I think this helps the air flow.
We live in a 1930's bungalow and the unit is fitted in the hall. We have it set on 4 which is quite high but seems to be what we need. There is a slight cool breeze right under the unit but it is not unpleasant, mostly we don't notice it. We've been using it now for nearly six weeks.