Air conditioning devices reordered — essentially wrong size, one's admitted (8) ? I've put ionizers rather than ionisers, as there is a z in size. Assuming it is an anagram of size, I can not...
31a) Time to act:our hero`s off pursuing the unknown (4,4) ?E??/???R
26d) Italian sculptor lost small instrument (5) P?A??
27d) Polish inside upright storage unit (4) ?I???...