What people keep running into with heating and cooling
Complaints tagged heating and cooling, each raised by more than one person. One-off posts are not included.
49 recurring problems · 507 people · 16 forums we read
Raised more than once
Most people first.
- 5What HVAC system should I choose for a new construction house?Choosing between options like heat pumps, regular AC units, and multi-stage furnaces for a new home build can be overwhelming without professional guidance. Homeowners are often left unsure which equipment makes sense for their specific region and climate, making it difficult to decide on a reliable setup.
- 5How to handle conflicting HVAC installation quotesWhen contractors give wildly conflicting proposals—ranging from massive ducted systems down to basic wall fans—it leaves homeowners stressed and unsure of who to trust. This discrepancy makes it difficult to evaluate the right approach or challenge an expert's design without worrying about causing offense.
- 5Why is car defroster air coming out of the main vents instead?When turning on the defroster, air continues to blast through the center and main dash vents instead of the windshield vents. This issue stops air from properly clearing the windshield, making it difficult to defrost the car.
- 5How to find plumbers who repair equipment instead of replacing itMost contractors refuse to clean or maintain older heating systems and push instead for costly full replacements. This leaves homeowners constantly searching for responsive help and feeling like they are rolling the dice every time something breaks.
- 5How to compare HVAC replacement quotesComparing bids is difficult because buyers must weigh a premium brand name against a cheaper unit with a better labor warranty. It is also hard to figure out if spending thousands more for a two-stage system is actually worth it for everyday comfort rather than just energy efficiency.
- 4Is it safe to put a couch over a floor heat vent?Blocking a floor supply vent with furniture restricts airflow and strains your HVAC system, while covering a return vent cuts off the intake air your system needs to circulate properly. In small spaces where layout options are limited, this can lead to uneven room temperatures and increased wear on the equipment.
- 4Why is water dripping from my furnace when AC is on?When the air conditioner runs, water drips directly from the furnace and pools on the ground. This unexpected leaking forces people to constantly mop up standing water and manage basement moisture.
- 4how to keep cold air out of mesh windowsStandard window mesh offers zero thermal insulation, allowing freezing drafts to pour straight through into the room. This makes it impossible to maintain indoor temperatures during cold weather without sacrificing the bug protection that the mesh provides.
- 4How to ventilate an attic with no open soffits?Older houses often lack open soffits and inlet air, leaving attics with outlet vents but no way for fresh air to enter. This traps heat and humidity, causes the second story to run nonstop, and leads to ice damming during winter.
- 4Is a seasonal HVAC tune up actually worth the money?Professional seasonal HVAC maintenance often comes with steep costs like $900 to $1,100 for repairs, leaving people who are out of work wondering if they can just handle it themselves. Paying these high prices strains tight budgets, but skipping service altogether makes it difficult to know if the system will run safely and reliably.
- 4How to tell which house vents are returns?Supply vents blow conditioned air into a room while return vents pull air back into the HVAC system. Because new systems or unlabelled grilles lack obvious airflow, homeowners struggle to tell them apart using simple tests like holding up paper towels, which stops them from properly balancing airflow or changing filters.
- 4How to cover a bulky AC unit without blocking airflowCovering or disguising a bulky AC unit restricts airflow and ruins cooling efficiency, even when using slatted covers. Enclosures also block the frequent access needed to pull units out for cleaning, leak repairs, and replacement, while hidden piping alternatives require lowering ceiling heights. This prevents residents from hiding unsightly equipment without risking unit damage or losing living space.
- 3Loud howling and whistling noise from vents after replacing blower motorSystem replacements like a new blower motor or squirrel cage often alter airflow dynamics, and if technicians skip installing a necessary bypass damper due to space limits, the system creates intense static pressure and howling. This leaves homeowners with a constant, disruptive noise through their vents and rooms blowing air even when their specific zone isn't calling for it.
- 3How to clean a mouse nest out of car ventsMice nesting in vehicle ventilation systems cause severe rattling and foul odors when the fan is turned on. Cleaning out the debris requires taking apart the accessible dashboard components to vacuum the core, letting you clear the nest without necessarily removing the entire dashboard.
- 3Why is my blower motor stuck on the lowest setting?A blower motor stuck on its lowest setting prevents the fan speed from changing even when you turn the dashboard dial or install a new resistor. Replacement parts, especially cheap ones, often burn out immediately, leaving the climate control system permanently trapped on low.
- 3Do mini-split heat pumps need a backup heat source in freezing weather?Mini-split systems can handle extreme cold up to a certain threshold — such as around -35°C — after which they stop heating and leave rooms unusable without alternative warmth. As outdoor temperatures drop, longer runtimes of 30 minutes or more are normal, though it can be difficult for homeowners to tell if this indicates expected behavior or an early warning sign of trouble.
- 3Loud noise from passenger dashboard when turning air to maxDebris, a failing bearing, or a cracked blower cage can cause a loud sound from the passenger side dashboard when the air is turned up. The noise is often so intense that drivers resort to turning up the radio just to drown it out.
- 3Why is there a massive temperature difference between floors?Multi-level HVAC setups frequently suffer from severe temperature gaps, leaving one floor freezing while areas of the lower level fail to cool. Because the system's thermostats interact across levels, trying to match temperatures can prevent the downstairs unit from running and leave the house completely unbalanced.
- 3What size heat pump do I need for a waterfront cottage?Choosing the right heat pump size and brand for a waterfront property requires balancing reliability with unique conditions like high wind and intermittent use. Oversizing or undersizing units, such as putting an 18k head in a 500 square foot loft, complicates quick warm-ups and leaves owners stuck trying to compare brands like Trane, Carrier, Rheem, and Goodman.
- 3How do you know if a furnace heat exchanger is actually cracked?Determining if a heat exchanger is truly cracked often requires using a borescope to inspect it from multiple angles, as technician photos can be ambiguous. When a technician flags an older, unmaintained furnace for safety failures, homeowners are left questioning whether it is a genuine hazard or an attempt to make money.
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