I have seen 'standalone' air conditioning units advertised for sale at approx $800. They are not evaporative units but are small refrigerative air coolers. There is no instalation required and I do not know if they are reverse cycle. Split systems are getting cheaper now but instalation can be quite expensive! At first glance these 'standalone' units appear ideal for small IPs and I was wondering if anybody has had any experience with this type of thing?