ask your doctor about a nebulizer. You do 4 treatments a day and should notice a big difference in a week or 2. It helped my kids a lot. Also if you are burning wood for heat STOP! We found that out as our oldest son got a lot worse when we lived in a house that only had a wood stove for heat. He sounded awful and wasn't getting better until the dr finally asked if we burned wood and that was the ultimate cure. We bought ceramic heaters for each room that shut off if they get tipped over so they were safe and don't cause fires. The new Edenpure heaters they have out now work great too to heat bigger open space areas. As soon as we quit burning wood he got 100 percent better and was off all meds within a week and rarely used his inhaler after that winter.
Keep him away from smokers, even the smell of their clothes can cause breathing problems. Dust also doesn't help so dust and vacuum often. Watch your windows for mold.. we lived in one apt that the windows had so much condensation that they would get mold in the tracks and had to clean the tracks out at least once a month.
We moved a lot when the kids were little so different climates affected their breathing.
Oldest was born in California.. he was born healthy but developed asthma symptoms at 3 months and coughed constantly with that cough and had nebulizer treatments every few weeks until we moved to Washington state. He did very well there and only occasionally used his inhaler during the fall and spring months but usually developed a cough during those seasons. We moved to TN--burned wood that first winter and he got awful--after we quit burning wood then he was fine and didn't have to use his inhaler again the following 2 years we were there. We moved to Georgia and all 3 of my kids developed asthma problems there to the point the doctor prescribed a nebulizer to use at home for all 3 of them. We lived there 3 years and moved to Kansas City and have been here 7 years. oldest that had all the asthma issues since 3 months old hasn't needed to use his inhaler at all since we moved here. The dr still monitors his asthma and says he still can't pass the breathing test so still has a mild case and still prescribes an inhaler for emergencies but he hasn't needed to use it at all. 2nd child has no issues and is very healthy here but was sick a lot in Georgia. 3rd one still uses nebulizer usually in the fall months and the dr is monitoring him but hasn't determined if he still has asthma or not--it is mild and usually occurs a month or 2 in the fall months. Playing in the leaves also triggers his and how to keep kids out of a leaf pile is pretty much impossible so he has to deal with coughing several weeks after playing in the leaves.
They can grow out of it and sometimes the environment can trigger asthma symptoms. If you have old carpet in your house that could be a major issue. Brand new carpet can also cause breathing problems with that strong new smell. Hardwood floors are best because carpet has so much dirt and dust trapped under it and in the padding. If you have ever taken out a carpet you will see and gross out knowing all that dirt was in your house and you didn't know it.
It does usually get better and he may even grow out of his as he gets older or when you figure out what allergies are triggering his. Since he just got over pheumonia he just probably needs more time to get better.
You can use a cool mist humidifier too, it helps but make sure you keep it clean so you aren't putting more pollutants into the air. The hot ones are not good for asthma.
Do not use cough suppressants. Cough syrups are suppressants. This keeps him from coughing and keeps the junk trapped in his lungs. Menthol cough drops are suppressants. Luden's has cough drops that aren't suppressants and are basically like candy. You can also buy the sugar free hard candies that are basically the same thing.
Hope your little one gets better soon.