A fascinating piece of work! The assessment of indoor bacterial growth has been rarely done using air sampling, which makes this study highly valuable.

A few minor comments that could help readers better understand the context of this study.

1. Was the environmental setting (i.e., RH, Temperature, activities carried out by occupants, the opening of windows, level of cleanliness) monitored prior to sampling? Could some of the indoor environmental conditions have affected the results reported?
2. Were the results from the living rooms of the 5 homes tested for studies A and B included in study C? If not, would it be of value to add the results of the 5 living rooms to the 52 samples?
3. Could you please mention how many of the 52 living rooms in study C were tested during each season? This would allow readers to see the distribution of samples in each season.
4. Could you please briefly mention the methods used to monitor the RH, T, ACH in the studies you cited (12, 17, 21)?
5. Please insert the axis title in figure 1 
6. It would be very helpful if we could also see the composition of bacteria with different seasons. This would help the readers to visualize the potential changes in the concentration of the most dominant species with seasons.
7. Would it be possible to report some key features like the temperatures, RH, and ACH measurements for the tested properties? These would help readers to understand better the relationship between the environmental context and the bacterial readings.