No AC here now!

When we put in our new house we got talked into putting in a Lennox above ground heat pump instead of a traditional Ac/ furnace system. the heating part worked fine but the Ac part never has worked. We went without all last summer because they claimed we had to small of duct work for our house so this last winter we replaced it. When we finally turned it on it only worked for 4 hours and shut down. they've been out every day this week including Saturday to replace or fix this and that and it still keeps shutting down. I'm going to try and see if they will pull the whole system out and just put in a AC unit instead. 3 of us have severe asthma and this week has taken a big toll on us. It's reaching the point that it is becoming life threating. Hope I can work out a deal with them tomorrow! We had a mild summer last year but this one is very hot with near 100% humidity and pollen is much worse this year than last further worsening the Asthma conditions. Our HMO said if we have to go onto oxygen this week or end up in the hospital they are going to sue Lennox and our contractor. Hope they agree to change things out quickly for us! Feel like I'm breathing mud today!