Gelco Damper Repair Nationwide

Gelco Damper Repair: The McKinney Owner’s Guide

Gelco damper repair in McKinney typically runs $280-$520 installed, depending on whether the throat plate, frame, or full assembly needs replacement. We stock Gelco-compatible parts on our McKinney trucks and can usually complete the swap during a scheduled visit. Most homeowners notice the failure when the damper won’t fully close, letting conditioned air escape up the flue year-round.

Call (469) 429-2623

The Gelco throat damper sits just above the firebox, exposed to creosote, moisture, and the thermal cycling that McKinney’s hard freezes and 100-degree summers deliver. After 15-25 years of that stress, the cast iron plate warps, the cotter pins corrode, or the handle linkage seizes. Corrine Halstead has replaced enough of these in older homes near McKinney’s Historic Downtown to recognize the sound of a plate that won’t seat - a metal-on-metal clink that means your heating and cooling dollars are climbing the chimney.

Which Gelco Models This Applies To

Gelco manufactured throat dampers in several widths, and the critical measurement is the inside width of your flue tile at the smoke chamber, not the damper plate itself. Common Gelco sizes are 24″, 30″, 32″, and 36″, though custom widths exist in pre-1990 installations. The model number, when visible, is stamped on the steel frame lip or cast into the handle bracket; if corrosion has eaten the stamp, we measure on-site.

The Gelco Original series used a cast iron plate with a stainless steel frame, while later Gelco Plus units switched to a galvanized frame that fails faster in Texas humidity. We source replacement parts through Haven’s buying network from Gelco, Olympia Chimney, and Famco, and we’ll tell you whether an OEM Gelco plate or a compatible aftermarket frame assembly makes more sense for your flue condition. One compatibility gotcha: some 1980s Gelco units were installed with a left-hand handle orientation that newer universal replacements don’t match without frame modification. We check that before quoting.

Signs Your Gelco Damper Repair Is Failing

• The handle moves but the plate doesn’t. The linkage pin or cotter connection has corroded through, common in McKinney homes where summer humidity settles into the firebox. The plate hangs partially open, and you’ll feel the draft even with the handle “closed.”
• You smell smoke in the room during a fire. A warped cast iron plate can’t seat flat against the frame, creating a gap that draws smoke backward when wind pressure shifts. This worsens after the metal expands from heat.
• Your energy bill jumps in winter and summer. An unseated damper is an 8″×30″ hole to the attic. In McKinney’s July heat, your AC works against a chimney that can hit 140 degrees. The plate doesn’t need to be visibly broken to leak air.
• The plate is rusted through or cracked. Cast iron doesn’t rust uniformly; it pits. Once the pitting reaches 1/8″ depth, the plate loses structural integrity and can fracture when operated. We document this with the camera before quoting replacement.
• The frame itself is pulling away from the mortar. The steel frame was mortared into the smoke chamber throat during original construction. Decades of thermal expansion loosen that bond, and the whole assembly shifts. This requires refractory repair, not just a new plate.

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Replacement Cost & What’s Included

What drives the range: plate-only swaps are straightforward when the frame is sound and accessible. Full assembly replacement requires removing the old frame from the smoke chamber throat, cleaning the seat, and setting the new unit in high-temp refractory mortar - a 90-minute job versus 35 minutes for a plate. We deliver a written price before scheduling, per Haven Standard Clause 1, and that price includes the NFPA 211 Level 2 camera inspection to confirm the repair sealed properly. Every Gelco damper repair carries our 365-Day Done Right Promise.

DIY or Call Us?

There’s one safe check a homeowner can make: with the firebox cool and a flashlight, look up the flue for daylight around the plate edges when the handle is in the closed position. If you see light, the damper leaks. What you cannot safely do is remove or adjust the assembly yourself. The plate and frame weigh 15-25 pounds, the workspace is a narrow throat above a drop, and a slipped cast iron plate can damage the flue liner or your hands. The refractory mortar used to seat a new frame must cure at controlled temperature, and an improperly seated damper can obstruct the flue or create a carbon monoxide path into living space. We bring the right staging, the right mortar, and the camera to verify the seal. Call (469) 429-2623 when you’re ready for the inspection - estimates are free, and we stock Gelco-compatible parts on our McKinney trucks.

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