We installed an air cleaning system to filter out any extra dust or pollen, it really helped my Mom, as the air conditioning made her uncomfortable sometimes, she liked it warmer than before,but it did help clean the air. We also had all the air vents etc. thoroughly cleaned as well as fireplaces. We installed outside doors over all doors so that we could close the door to the house before opening the outside, sort of lots of foyers. We also had a self supporting energy system, I don’t remember what they are called, so that if the electric went out it would not effect the air cleaning system or the oxygen she eventually needed, or the heating or air to make her uncomfortable. We also closed off the laundry rooms so that lint dust etc. did not enter the house. The doctor recommended these things. If you fly wearing a mask you will need a doctor’s note, that you are not contagious but are preventing breathing in germs from others potentially or they can refuse to let you board. Not a good thing. Also we used all natural products for cleaning as a lot of commercial cleaning agents are toxic when breathed even in small amounts by someone with lung issues, they can cause coughing and inflammation etc… We already had water filtration just the type on the faucet that everyone has, but she always bathed never showered, so that might be a good idea, we have had patients with aspirated aspergillus which grows in showers. Hope you find a wonderful new home. And good luck and Happy Easter!