Ductwork Repair & Airflow Fixes for every room
If one bedroom is always stuffy and the living room is always cold, the equipment may be fine. The air just isn’t getting where it should. We find out why and fix it.
Call 650-460-3483438 Cambridge Ave, 94306
Duct repair in Palo Alto fixes the most common cause of uneven rooms: air leaking or getting stuck before it reaches the vent. Older homes often have disconnected runs, crushed flex duct and undersized returns in attics and crawlspaces. ComfortFlow measures airflow at each register, seals or replaces failing sections, and balances the system so every room gets its share.
Signs your ducts are the problem
- One or two rooms never match the thermostat
- Weak airflow from vents farthest from the equipment
- Dust that returns quickly after cleaning
- A whistling return grille or doors that slam when the system starts
- High bills with equipment that seems to run fine
- Musty smells from a crawlspace system
Why Palo Alto homes have duct problems
Many Palo Alto homes were built long before central air existed. Ducts were added later, threaded through tight attics and shallow crawlspaces, often with long runs of flexible duct that sag, kink or get stepped on. Decades later, joints separate and insulation breaks down. In homes that have been remodeled, rooms were sometimes added without any new duct capacity at all.
How we diagnose airflow
We measure, not guess. That means static pressure readings at the equipment, airflow at each register, and a look at every accessible run. When it’s useful, a duct leakage test quantifies how much conditioned air is escaping into the attic or crawlspace.
What we fix
- Sealing joints and seams with mastic and UL-listed tape
- Reconnecting separated runs and replacing crushed flex duct
- Adding or enlarging returns so the system can breathe
- Re-insulating ducts in attics and crawlspaces
- Balancing with dampers so every room gets the right share
- Redesigning duct systems for new heat pumps, which move more air at lower temperatures
Ducts and heat pumps
If you’re planning a heat pump, get the ducts checked first. Heat pumps deliver air at lower temperatures than gas furnaces, so leaks and undersized runs that you never noticed before can make a new system feel weak. Fixing ducts during the heat pump install is far easier than going back later.
Duct problems and fixes at a glance
| Problem | Effect | Fix |
|---|---|---|
| Disconnected or torn ducts | Conditioned air lost to attic or crawlspace | Reconnect and seal |
| Crushed or kinked flex duct | Weak airflow to one room | Replace and support properly |
| Missing or small return | Pressure imbalance, noisy grilles | Add or enlarge return |
| Uninsulated ducts | Lost heating and cooling | Insulate to current code |
| Leaky return in crawlspace | Dust and musty smells | Seal with mastic |
| Undersized trunk | Rooms at the end never comfortable | Redesign and resize |
Why Palo Alto homeowners choose ComfortFlow HVAC Palo Alto for ductwork and airflow
ComfortFlow HVAC Palo Alto has served Palo Alto homes for over 10 years from our shop at 438 Cambridge Ave. We measure static pressure and room-by-room airflow before and after the work, so you can see the improvement, not just feel it.
- Diagnosis before recommendations. We measure first, then explain what we found in plain language.
- Repair prices up front. You see the cost before any work begins, and replacement only comes up when it makes sense.
- Local know-how. CPAU rebates, the City heat pump instant permit, Eichler radiant systems and Palo Alto’s older housing stock.
- Respect for your home. Drop cloths, protected floors and trim, and a clean work area at the end of every day.
Ductwork & Airflow, step by step
- MeasureStatic pressure, register airflow and a visual of every reachable run.
- Find the lossesLeaks, kinks, disconnects and undersized returns.
- FixSeal, reconnect, replace or redesign.
- BalanceRe-measure and adjust until rooms even out.
Often paired with ductwork & airflow
Ductwork & Airflow across Palo Alto and nearby
We’re based at 438 Cambridge Ave and work in every Palo Alto neighborhood. Local notes for each area:
New to us? Start with our overview of HVAC in Palo Alto.
Ductwork & Airflow questions,
answered.
Answers from the ComfortFlow HVAC Palo Alto team about ductwork & airflow in Palo Alto homes.
Why is one room always hotter than the rest?
Usually a long, leaky or crushed duct run, a missing return, or sun exposure the system was never designed for. We measure airflow to that room to find the cause. In Palo Alto, the hottest rooms are usually upstairs bedrooms, rooms over garages and additions with long duct runs. Sun exposure on west-facing glass adds heat every afternoon. The fix might be sealing and resizing the duct, adding a return, balancing dampers, or a dedicated ductless head for that room.
Is duct cleaning worth it?
Sometimes, after construction or if there’s visible debris or pests. More often, sealing leaks and improving filtration does more for comfort and dust than cleaning. Cleaning makes sense after a remodel, if there is visible debris or rodent activity, or if a crawlspace duct has been contaminated. Otherwise, sealing leaky return ducts that pull dust from attics and crawlspaces, and upgrading to a better filter, usually improves air quality more. ComfortFlow HVAC Palo Alto will tell you honestly which one your home needs.
How long do ducts last?
Flex duct often needs replacing after 20 to 25 years as the liner and insulation break down. Metal ducts last longer, but joints still need sealing. Signs of aging ducts include brittle or torn insulation, flattened flex runs, disconnected joints and dusty supply registers. Attic ducts in older homes face heat that speeds up deterioration. Replacing a few failing runs is often enough; a full duct replacement makes sense when many sections are failing or undersized.
Can you add ducts to a room addition?
Yes, if the system has capacity. If not, a ductless mini-split for the addition is often the better solution. Adding a supply duct to a system that is already at capacity just steals air from other rooms. We measure static pressure and airflow first. If the system has room, we add a properly sized supply and return. If not, a ductless head gives the addition its own heating and cooling without affecting the rest of the house.
Do I need new ducts for a heat pump?
Not always. Many existing duct systems work well after sealing and a few changes. We test before recommending replacement. Heat pumps move more air at lower temperatures than gas furnaces, so undersized or leaky ducts show up quickly as weak airflow or uneven rooms. Fixing ducts during the heat pump install costs less than going back later. ComfortFlow HVAC Palo Alto tests static pressure and airflow before recommending any duct changes.
Let’s make home
feel better.
Tell ComfortFlow HVAC Palo Alto what’s happening with your heating or cooling, and we’ll start with the right questions. Serving Palo Alto, Menlo Park, Mountain View, Los Altos, Stanford and the Peninsula.