In Cumming, we walk into a lot of beautiful bathrooms — in Windermere, Polo Golf & Country Club, and the newer builds off Bethelview Road — where everything looks updated except one thing nobody thinks about: the bathroom exhaust fan.
It is either loud and rattling, quiet but not actually moving air, or painted over and barely spinning. Meanwhile the mirror stays fogged for an hour, paint bubbles above the shower, and there is a faint musty smell that air freshener does not fix. In Georgia humidity, that is not a minor annoyance. That moisture is soaking into your drywall and ceiling every single day.
A working exhaust fan, sized and vented correctly, is the cheapest mold prevention you can buy. Here is what it costs in the Atlanta area and how to know if yours needs to go.
Why Cumming Bathrooms Struggle With Moisture
Cumming homes have a mix of older ranches near downtown and large two-story homes built during the Forsyth County building boom. Both have the same issue: tight, well-insulated bathrooms with big walk-in showers that produce a lot of steam, and fans that were chosen by a builder for price, not performance.
Builders often install a 50 CFM fan in a bathroom that needs 80 to 110 CFM. CFM is cubic feet per minute — how much air the fan moves. The rule is roughly 1 CFM per square foot, plus extra for a jetted tub or a separate shower and toilet area. An undersized fan will run, it will make noise, but it will not clear the room in the 20 minutes after a shower when it matters.
The second problem is venting. Some fans vent into the attic instead of outside, or the duct has come loose. That just dumps warm, wet air onto your attic insulation and roof deck — a perfect setup for mold you cannot see until it stains the ceiling below.
What Bathroom Exhaust Fan Installation Costs in Atlanta
For a straightforward replacement in Cumming in 2026 — swapping an existing fan for a new one using the same duct and wiring — most homeowners pay $275 to $475 installed. That includes the fan unit itself ($80 to $200 for a good, quiet model) and labor.
If we need to enlarge the ceiling opening, run new ductwork to the roof or soffit, or add wiring for a fan with a light or heater, the range is $550 to $900. A first-time installation in a bathroom that never had a fan is $750 to $1,200 depending on attic access and duct length.
Models with humidity sensors that turn on automatically cost a bit more upfront but are our top recommendation for kids’ bathrooms and guest baths where nobody remembers to flip the switch. A quiet fan matters too — if it sounds like a jet engine, your family will not use it. Look for 1.0 sone or less; you can barely hear those running.
Compare that to mold-damaged drywall repair at $400 to $900 per bathroom wall section, plus repainting, and the fan pays for itself the first time it prevents a repair.
Signs Your Fan Needs Replacing
Your mirror is still fogged 30 minutes after a shower with the fan on. Paint or caulk around the shower keeps peeling or growing dark spots. The fan rattles, hums without spinning, or the cover is yellowed and cracked. You hold a tissue up to the fan and it barely flutters — a good fan should pull it firmly against the cover.
Also check the outside vent if you can find it. If the flap is stuck shut with paint or a bird nest, the fan cannot exhaust no matter how new it is.
We can test all of this in a few minutes during a visit. Often we are already at a Cumming home for drywall repair and find the fan was the root cause — fixing the drywall without fixing the ventilation just means we will be back in a year.
What a Proper Install Includes
A good install is more than four screws in the ceiling. We size the fan to the room, confirm the duct is 4-inch (not crushed flex duct choked down to 3-inch), seal the housing so air does not leak into the attic, and make sure it vents fully outside — never into the attic or soffit cavity.
We also set you up with a timer switch if you do not have one. The fan should run during the shower and for 20 to 30 minutes after. A timer means you can leave the house without leaving the fan on all day or turning it off too soon.
If your ceiling drywall is already soft or stained from years of moisture, we can patch and paint that in the same visit. That one-visit fix — new fan, drywall repair, and fresh paint — is exactly where a handyman saves you money over calling an electrician, a drywall crew, and a painter separately.
Living in Cumming and tired of a steamy, musty bathroom? Just Fix Today installs and replaces bathroom exhaust fans across Forsyth County with same-day estimates. Call us at (678) 549-8083 — we will size it right, vent it right, and your mirror will actually clear.
FAQs
How do I know what size fan my bathroom needs?
Measure the room. An 8×10 bathroom is 80 square feet and needs at least an 80 CFM fan. Add 50 CFM for a jetted tub or enclosed shower. When in doubt, go one size up — a slightly larger, quiet fan on a timer is better than a small loud one.
Can a handyman install a bathroom fan or do I need an electrician?
If wiring already exists, a handyman can replace the fan. For brand-new wiring from the panel or moving electrical, a licensed electrician may be needed. We will tell you honestly which case yours is before we start.
How long does a replacement take?
A like-for-like swap takes about 1.5 to 2 hours. New ductwork or a larger opening usually makes it a half-day job. We cover the tub and floor and clean up the drywall dust before we leave.
Why is my new bathroom still growing mold on the caulk?
The fan helps the room dry, but old silicone caulk that has already separated will still trap moisture. Recaulking with mold-resistant silicone after the fan is fixed gives you a clean start — we often do both together.
Should I get a fan with a light or heater?
If your bathroom is chilly in winter, a fan-heater combo is popular in Cumming’s larger primary baths. Fan-light combos work well if your ceiling has only one fixture spot. Both cost more than a basic fan but save adding a second ceiling cut.
Do I need to run the fan in winter?
Yes — showers produce the same moisture year-round. In winter it also prevents condensation on cold windows and mirrors. A humidity-sensing model handles this automatically so you do not have to think about it.