checklist

Pre-Winter Checkup

The Pre-Winter Attic Checkup for Plano-Area Homes: Insulation, Ventilation, and Ducts

The National Weather Service puts the average first freeze in Dallas-Fort Worth at November 22. In a 1980s or 1990s Plano home, the attic decides how that first cold week feels: how much heat leaves through the ceiling, whether moisture has anywhere to go, and whether the warm air the furnace makes actually reaches the bedrooms through the ducts running across the attic floor. Trotter Air Services has been in these attics since 1970. This guide is the checkup we would do in yours, in three parts you can start on your own with a flashlight and a ruler, before the season when a cold room or a long-running furnace becomes the first sign something is off.

call 972-424-9233 Free Insulation Assessment

Timing

Why October Is the Month to Look

Two things line up in October. The attic is finally cool enough to spend twenty minutes in, and there are still several weeks before the first freeze to get anything you find corrected. Wait until December and you are diagnosing the problem through the symptom instead: a bedroom that never warms up, a furnace that runs for long stretches, a thermostat that reads right while the house feels wrong.

There is a second reason this year. The late-April 2026 hail storms put new roofs on a large share of homes across Plano, Frisco, McKinney, Allen, Richardson, and Garland. A roof replacement changes the attic underneath it more than most homeowners realize, and this is the first heating season those attics will go through. Part 2 is written for those houses.

Part 1

Insulation: The Ruler Test

R-value is a measure of how well a material resists heat flow; more is better, and it adds up with depth. You do not need a meter to estimate it. From the attic hatch, push a ruler or tape straight down through the insulation to the drywall in three or four spots away from the hatch, and note the material: loose gray or white fluff with a glassy sheen is blown fiberglass, gray-brown shredded paper is cellulose, and pink or yellow blankets are batts. Then read the table.

Measured depth	Blown fiberglass, approximate R-value	Cellulose, approximate R-value	What it means for a Plano attic
3 to 4 inches	About R-8 to R-11	About R-10 to R-15	Typical original 1980s and early 1990s install after settling. Well below target.
6 to 8 inches	About R-13 to R-22	About R-19 to R-30	Common in homes that were topped up once. Still short of target.
14 to 17 inches	About R-30 to R-45	About R-45 to R-60	Fiberglass at this depth is at or near R-38, the target for an attic that started with 3 to 4 inches.
18 to 22 inches	About R-40 to R-60	About R-58 and up	Fiberglass here reaches R-49, the target for an attic insulated from bare drywall.

Ranges reflect published per-inch values for loose-fill fiberglass (roughly R-2.2 to R-2.7 per inch) and cellulose (roughly R-3.2 to R-3.8 per inch). Settled, compressed, or damp material performs below these numbers.

The target for our climate zone

ENERGY STAR's recommendation table, based on the 2021 International Energy Conservation Code, puts North Texas in Climate Zone 3. For Zone 3, an uninsulated attic should be brought to R-49, and an attic with an existing 3 to 4 inches should have R-38 added on top of what is there. If your ruler reads under 10 inches almost anywhere, the attic is a candidate for a top-up regardless of which material is in it.

Three things that matter more than adding depth

Air-seal the ceiling plane first - Every ceiling light box, plumbing stack, duct boot, and top-plate gap is a hole between the house and the attic. Warm indoor air leaks up through them all winter. Sealing those before blowing new insulation over them is the difference between an attic that performs to its R-value and one that does not.
Uncover the compressed and bare areas - Look for insulation that was walked on, piled to one side by a previous technician, flattened under stored boxes, or scraped away around the hatch and the furnace platform. A bare spot the size of a card table costs more than a shallow layer across the whole attic.
Never bury the soffits - Insulation pushed out to the eaves blocks the intake vents that the whole ventilation system in Part 2 depends on. Baffles hold the airway open; if you cannot see daylight or feel air at the eaves, that is a finding.

Blown-in or foam?

For most 1980s and 1990s homes with a vented attic and the ductwork above the ceiling, a top-up of blown-in insulation over a sealed ceiling plane is the right tool: it goes over what is there, it reaches the targets above, and the free assessment we already offer starts with the same ruler test. Spray foam on the roof deck turns the attic into conditioned space, which is a different project with a different set of ventilation rules; it earns its place when the ducts and equipment up there are worth bringing inside the envelope. Before you decide, check whether your address qualifies for help paying for it in our city-by-city rebate guide.

Part 2

Ventilation, Especially If Your Roof Was Replaced After the April Hail

An attic ventilates by letting cooler outside air in low at the soffits and letting warmer, moister attic air out high, through a ridge vent, turbines, static roof vents, or a fan. A roofing crew is focused on the shingles, and the ventilation that was there before tear-off does not always come back the same. Here is what we have seen change on post-storm roofs across Collin County:

Turbines and box vents swapped for a ridge vent - Often an improvement, but only if the old openings were fully sealed and the ridge cut actually extends the length of the ridge. A ridge vent installed over an uncut deck is decoration.
Solar attic fans removed and not reinstalled - A fan that came off with the old roof sometimes goes back on with the panel shaded, the thermostat disconnected, or not at all. Look for the fan from the ground and from inside: you should see the housing from below.
Soffits blocked by tear-off debris - Old shingle grit, felt, and nails end up in the eaves and on top of the baffles. Blocked intake starves every exhaust vent on the roof.
Baffles knocked loose and insulation trampled - Crews walk the attic to check for leaks and nail pops. The ruler test in Part 1 will show it.

The one rule

Intake low, one kind of exhaust high, and never two exhaust types competing. A ridge vent next to turbines, or a powered fan on a ridge-vented roof, pulls its air from the nearest opening, which is the other exhaust vent rather than the soffits. The result is a short circuit: the roof looks well ventilated and the attic floor never moves any air. A solar attic fan belongs on a roof with clear soffit intake and without a continuous ridge vent, which is exactly why we check the existing vents before recommending one.

Winter is a moisture season for attics

Summer ventilation is about heat. Winter ventilation is about water. Warm indoor air carries moisture up through the ceiling plane and condenses on the cold underside of the roof deck on freezing nights. Adequate intake and exhaust carry that moisture out; a sealed-off attic keeps it, and the first sign is usually frost or dark staining on the nails and sheathing near the ridge. In a spray-foam sealed attic the rules are different because the roof deck is inside the envelope, which is one more reason blown-in and foam are different projects rather than a matter of preference.

If the roofer changed the ventilation and you are not sure the result follows the rule above, ask us to look. We will tell you what the attic has now, what it needs, and whether the fix is on our side or the roofer's.

Part 3

Ducts in the Attic: What to Look for Before Heating Season

In most Plano-area homes the entire duct system lives in the attic: a sheet-metal or flex trunk from the furnace, flexible runs to each room, and one or more returns. Anything that leaks, sags, or disconnects up there dumps heated air into the attic and pulls attic air into the house. Before the furnace runs every day, walk the runs with a flashlight and look for:

Disconnected or slipped boots - The flex run should be strapped tight to the metal boot at each ceiling register. A run that has pulled off is heating the attic. If a room went cold after any recent attic work, start here.
Crushed or kinked flex duct - Flex that was stepped on, buried under stored items, or bent sharply over a truss carries a fraction of its rated airflow. The rooms at the end of that run are the ones that never warm up.
Insulation dust at the returns after a blown-in job - A return with a gap at the plenum or an open joint pulls fibers from fresh insulation into the system. The symptom is gray dust at the supply registers within days of the attic work. The fix is sealing the return, not repeated cleaning.
Sweating on humid days - Condensation on the outside of the duct jacket shows where the insulation is missing or compressed. It also points to a leak drawing humid attic air across a cold surface.

When cleaning is the answer, and when it is not

The Environmental Protection Agency does not recommend that ducts be cleaned routinely, only as needed, and it names the situations that warrant it: substantial visible mold inside hard-surface ducts or on other components, ducts infested with rodents or insects, and ducts clogged with enough dust and debris that particles are actually released into the home from the supply registers. Those three cases are the reasons our duct cleaning service exists. Dust that traces to a filter that does not fit, a return that is drawing from the attic, or a joint that has come open is not one of them; cleaning would leave the cause in place. In those cases the honest recommendation is to close the leak and fix the filter first, and we will say so on the visit.

Duct sealing and repair are a separate scope from cleaning. If the walk-through above turns up a run that needs to be reattached or a return that needs to be sealed, we will describe exactly what we found and what has to happen, in writing, before anything is scheduled. The same goes for a furnace that has been struggling: our furnace repair and heat pump maintenance visits start with the equipment, but a technician who has just read this guide's checklist will look up at the ducts too.

Do It Yourself

The 10-Minute Homeowner Attic Check

A flashlight, a tape measure, and a phone camera. Stay on the framing or a board laid across it, never on the drywall between the joists.

Open the hatch and look at the underside of the hatch itself. If it is bare, that opening is the biggest single leak in the ceiling. Note whether it has weatherstripping and an insulated cover.
Measure insulation depth in three spots away from the hatch, and note the material. Compare to the table in Part 1.
Look for bare, compressed, or scraped areas around the furnace platform, the hatch, plumbing stacks, and anywhere someone has walked. Photograph them.
Check the eaves for daylight or airflow. With the attic light off, you should see faint light at the soffits, and on a breezy day feel air. Buried or debris-filled soffits are a finding.
Count the exhaust types on the roof from the ground: ridge vent, turbines, box vents, a fan. More than one type means the short-circuit rule in Part 2 applies.
If the roof was replaced this year, compare before and after. Insurance photos or a listing photo will show what the old roof had. Confirm any fan went back on and any old vent openings were closed.
Follow each duct run from the trunk to the register and look for slipped connections, kinks, and runs buried under insulation or boxes.
Look at the return side where the return duct meets the furnace. Gaps at the plenum, tape that has let go, or fibers visible at a joint mean the system is drawing attic air.
Check the roof deck near the ridge for dark staining, rusty nail tips, or frost lines on a cold morning. That is the winter moisture sign.
Write down what you found and what you could not see. That list is exactly what our free insulation assessment starts from, and it saves the first fifteen minutes of the visit.

FAQ

Frequently Asked Questions About the Pre-Winter Attic Checkup in Plano, TX

It depends on the material. Loose-fill blown fiberglass reaches about R-38 at roughly 14 to 17 inches of settled depth, and cellulose reaches it at roughly 10 to 12 inches, because cellulose carries more R-value per inch. Batts are labeled, so read the facing. If the material is compressed, damp, or has settled unevenly, it performs below the number the depth suggests, which is why we measure in several spots rather than one.

Yes, as long as the existing layer is dry, undamaged, and free of contamination; the new material simply adds to it. Our blown-in insulation page covers the details and the exceptions we look for during the inspection.

Not as a routine step. If the duct system was sealed and the returns were intact, the new insulation stays in the attic where it belongs. If gray dust shows up at the supply registers within days of the job, that is a sign a return or a joint is open and drawing fibers in; the fix is to seal that opening, and then a cleaning may be warranted to remove what already got in. Cleaning without sealing just repeats the problem.

Only a little. Most solar attic fans have a thermostat that stops the motor when the attic is cool, and winter days are short, so the fan runs far less than it does in July. The winter job of moving moisture out of the attic falls mostly to the passive intake and exhaust, which is why Part 2 focuses on soffits and the exhaust type rather than the fan. A fan on a roof that lost its soffit intake in a re-roof can make winter moisture worse by pulling air from the house instead.

Replacing or altering ductwork in Plano generally requires a mechanical permit, and the licensed HVAC contractor performing the work is the one who pulls it and schedules the inspection; a homeowner should not be asked to do that. Cleaning existing ducts and inspecting them does not. The permit requirement is one reason to be cautious about a low-priced duct offer that never mentions one. Confirm the current requirement for your project with Plano Building Inspections.

Found Something on the Checklist?

Bring us your notes and photos. We will measure the attic, check the ventilation and ducts, and tell you in plain words what needs to happen before the first freeze. Family-owned since 1970.

call 972-424-9233 Request an Assessment

handshake

Assessment Before Product

The free insulation assessment from Trotter Air Services starts with the same ruler test on this page, and if the attic does not need more insulation we say so. Three generations of the Trotter family have built this business on that. NATE-certified, BBB Accredited, Texas License TACLA50795E.

description