In order to quantify the effects of the window treatments on the microclimate, climate sensors were deployed under three pairs of windows and at nearby soil-surface mosses. These windows were installed specifically for this purpose and moss samples were not collected from them. To log relative humidity (RH) every five minutes, iButton hygrochrons (Maxim Integrated, San Jose, CA, USA) were deployed under three pairs in winter (February) and one pair in summer (September) 2019 for a period of four and two days, respectively. In September, an iButton hygrochron was also used to measure RH of a nearby (within 1 m of windows) un-manipulated site reference moss cushion. RH data from iButtons were summarized to mean daily highs and lows per site and by treatment (UV-filtered, UV-transmitted, plus site reference for summer) and tested for significance of treatment effects with a one-way repeated measures ANOVA for the winter and summer data sets. Tukey’s HSD tests were performed as post-hoc analyses (Tukey, 1949).