LimeSlice - I wanted a HAB but same problem. They're not the same style (they're a sling style) but you could try a comfy carry made by babyrock. I have one, but at the moment Euan doesn't like it very much (not good advertising LOL!) but prefers the baby bjorn because he's upright. I'm going to keep trying him in the comfy carry though - I reckon he will like it when he can sit upright in it. I have the 'airflow' version of the baby bjorn and it's not too hot. But the HABs are supposed to be the comfiest.

ETA - I just noticed that Peggy has suggested the same thing about the comfy carry.