Hydrolyzes trehalose to glucose. Could be involved, in cells returning to low osmolarity conditions, in the utilization of the accumulated cytoplasmic trehalose, which was synthesized in response to high osmolarity. alpha,alpha-trehalose + H2O = alpha-D-glucose + beta-D-glucose Glycan degradation; trehalose degradation; D-glucose from alpha,alpha-trehalose: step 1/1. Monomer. Belongs to the glycosyl hydrolase 37 family.