RV windows fail in pieces — a strut here, a latch there — but owners often price a whole replacement window at the first problem. Before you spend $500+, walk through what's actually broken. Most window complaints trace to a part that costs $25–$55 and installs with a screwdriver.
Window won't stay open (or slams shut)
Dual-pane hopper windows are held open by small gas struts, and struts wear out — first the window drifts closed on hot days, then it won't hold at all. Replacement is a two-screw job per side: Black Series OEM window struts come as a pair ($25) in 6″, 9″, and 11″ lengths — measure your old strut end-to-end, and always replace both sides so the window opens evenly.
Latch won't lock, or the button broke
Window latches are UV-exposed plastic doing a mechanical job; eventually one cracks or stops clicking shut. A window that won't positively latch is a security problem and a road-noise problem. The OEM window latch ($30) comes in left and right versions, in the current red-button style and the older black-button style — match the side and button color to what came off.
Torn or sagging insect screen
Screens re-screen — you don't buy a whole new frame. Fresh screen mesh plus OEM screen retainer clips ($53, pack of 8 stainless clips) locks new mesh into the existing frame channel. While you're in there, check the shade: Black Series windows use a combined reflective shade & screen slide assembly if the whole insert is past saving, and generic pleated shades with broken cords can be re-strung with a $12 restring kit.
Pane rattles on the road
A rattling skylight or window pane usually means a glass retainer clip has let go, leaving the pane loose in its channel. The OEM skylight window clip ($53) re-seats the pane — fix it early, because a loose pane flexing down the highway eventually becomes a cracked one.
Cleaning acrylic without ruining it
Most RV windows are acrylic, not glass — and household glass cleaner is their enemy. Never use ammonia-based cleaners (that's most blue window sprays) or abrasive pads: ammonia clouds acrylic permanently and scrubbing leaves swirl scratches. Rinse dust off first, then wash with mild soap, plenty of water, and a clean microfiber cloth. Small scratches polish out with a dedicated acrylic polish.
When it really is the window
Cracked panes, fogging between the two panes of a dual-pane unit, or a bent frame that no longer seals are whole-window problems. Measure carefully and use the Black Series window size chart & cross-reference to find your exact-fit double-pane acrylic replacement window — nine sizes with the fly screen and shade built in, from $429.