to moulds can be a big problem especially for people who have asthma
. Suggest you get either blood tests (specific IgE) against fungal allergens/mould mix or see an Allergist for skin prick testing against moulds and fungal allergens.
Deepending on where you live, it will be important to get the right mix of moulds and fungal allergens tested. The Environment Agency can then also do a home air sample to see if there is a high concentration of moulds in your home. Mind you all homes will have fungal allergens but should not be high levels and as you are asthmatic it becomes even more important to exclude this.