Colorado's geology makes radon common statewide. Test every few years (cheap kits work), mitigate with standard sub-slab systems when results demand, and verify existing systems' fans annually — they run continuously and fail quietly. Buyers expect documentation; keep it.
Single-digit winter humidity cracks trim, gaps floors, and shrinks framing slightly each season. Whole-house humidifiers (pads changed yearly) protect wood and comfort. Watch caulk lines annually — the dryness opens them.
Gas appliances derate at elevation and want proper orifice setup; swamp coolers work beautifully in dry air but demand seasonal commissioning; and UV intensity ages roofing and finishes faster than the calendar suggests.
Front Range clays move with moisture: keep grading away, water foundations modestly in droughts, and read door-frame squareness seasonally like a gauge.
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