...if your trip to a household store results in a large collection of unrelated items, none of which your actual apartment has a need for (I bought two shoe shelves...and I don't have the room or inclination to store shoes that way, they're to add storage space under my tent)
...if you have to wear a hoodie in your bedroom in the summer because the AC is set to 'icicles on the ceiling' to cool your tent.
...if the flowers in the landscaping are suddenly doing much better (if I screw up mixing nutes, rather than dumping them down the sink I go outside and give it to the flowers)