Posts Tagged ‘HVAC repair’

7 Reasons Your Home Heater Is Blowing Cold Air & What To Do

Thursday, November 8th, 2018

Home Heater Blowing Cold Air? Here’s What It Could Mean

7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air

A friend of ours bought a new house recently. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known.

new homeowner's heater blowing cold air and ac was blowing warm airWhen he turned on the heater, the outdoor unit didn’t seem to be working right, but the indoor unit, an air handler, came on and seemed to heat the house. Though on closer inspection, the heat seemed pretty weak. When he turned on the air conditioner, warm air came out.

So, when the new homeowner called an HVAC specialist (not us, because he was outside our service area – click here and scroll down to see if you’re in it), he learned what was really happening.

A system error in the controls of the heat pump was forcing an automatic system shutdown just seconds after it started. That was tripping on the air handler, which was supposed to be only for emergency heat. Even more strange, the previous owners had rewired the system somehow so the air handler came on every time, even for air conditioning. Hence the hot air.

But the heat pump was also just very old, and repairing it would have cost nearly the same as just getting a new one, which is what they ended up doing.

Why tell this story? Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air.

7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air

There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. But all you have to work with are the symptoms. The heater’s blowing cold, or the AC is blowing hot. Here are just a few things that could mean:

1) Dead Batteries in Thermostat

Seems silly, but you’d be surprised how often this has happened. You’re standing there pushing buttons trying to heat up the house, but it’s just not working. You can hear it blowing, but no heat is coming out. Sometimes this happens simply because your batteries have died. (This problem depends in part on the type of thermostat, of course).

It’s also possible you have it on the wrong setting, such as ‘fan’ as opposed to ‘heat’. Again, this depends on your specific type of thermostat.

2) Clogged Air Filter

filthy clogged air filters are one possible reason your heater is blowing cold air
For a heat pump or heater to produce warm air, air must flow easily through the filter. Otherwise it has to work a lot harder just to pull the air, which means you’ll get less warm air coming out than you should. Likewise for the air conditioner. The harder it has to work to pull air through the filter, the less efficient it will be.

If energy efficiency is as important to you as heating or cooling your house, making sure you have a clean air filter is a critical troubleshooting and maintenance step.

3) Interrupted Startup Sequence

This was part of the problem our friend was dealing with. His heat pump was starting up and then shutting off immediately, and the emergency heat was taking over. When he had a professional look into why this was happening, he learned it would be an expensive repair job on an outdated heat pump.

4) Improper Installation

The previous owners in our friend’s house probably realized their heat pump was failing, so they rewired the system in a convoluted way to get around the problem, rather than deal with it properly. Their improper installation thus led to the air conditioner blowing hot air.
an improper installation led to this ac blowing warm air

5) Dead Circuit Board

Maybe it got shorted out. Maybe it just died of old age or malfunction. But a dead circuit board ends your furnace’s attempt to heat your house real quick.

6) Worn Down or Busted Motors

Motors that turn the fans and make the conversion process from warm to cold (or cold to warm) work right can get old and rusty, or break down for other reasons. If that happens, your heater (or AC) will not produce the temperature of air you want it to.

If you hear that irritating screeching sound when your system turns on, this could be the reason (though it’s not the only reason that happens).

7) Damaged Ducts

It could be that your heater is working just fine. If your ducts have cracks or worse, then the cold air blowing into your house might be coming straight from outside right into your ducts, mixed in with the warm air your perfectly functional furnace is producing.

What Can I Do If My Heater Is Blowing Cold Air?

You’ve got three basic options.

three options for what to do if your heater is blowing cold air
First – make it worse. That’s what our friend’s former homeowners appear to have done. They worked around a failed heat pump by making the emergency heat the main heat. This rendered the AC useless. And, it increased their heating costs a ton, because the air handler is a far more expensive way to heat a house than the much more efficient heat pump.

Second – test out the simple explanations. Check the air filter. Check the thermostat. You might even try turning your circuit breaker off and back on. These simple fixes might solve the problem, saving you lots of trouble, frustration, and expense.

Third – hire a professional. If your heater is blowing cold air, and it’s not one of the first two possible explanations on this list, then you’ll need a specialist to at least come and take a look. You might be able to tell if your ducts have a leak, but fixing them is another issue.

The last five items on the list above require a professional or a new furnace or heat pump to fix them.

If you need a professional and you live in our service area, we’d love to help.

Click the link below, scroll down to see if you’re in our service area, and if you are, tell us what’s going on with your HVAC system.

Help Fix My Heater/Heat Pump

Did the Winter Weather Damage Your Air Conditioner?

Thursday, March 30th, 2017

Spring AC Maintenance: Don’t Wait Until July to Find Out If Your AC Still Works!

Summer is coming. And even here in the Pacific Northwest, we get a couple of hot months each year, and usually a few weeks of miserable heat. After some extreme winter weather, you don’t want to wait until the hot days arrive to find out if your air conditioner still works.

We recommend testing out your AC in April or May during the first warm spell. Just turn it on and run it for an hour to see what happens.

Feel the air coming out the vents.
Go listen to the unit operate.
Look around the unit to see if there are any liquids coming out.

If everything seems to be working okay and you don’t hear any strange noises, then you might only need minimal maintenance work done. But if anything’s not quite right, or if the whole system isn’t working, you’ll be glad you caught it now before the first serious heat wave hits the area.

Tips for Spring AC Maintenance

The secret to avoiding big AC repair costs is consistent care and ongoing maintenance. And the simplest thing you can do is to clean or replace the filter regularly. A clogged filter reduces the efficiency of the unit, which means higher costs for you because it has to work harder to perform the same task.

Note: The filter is in the indoor AC unit, not the outdoor component. If you don’t know much about air conditioners, checking the filter is probably best left to an expert.

A good indicator that your filter may be clogged is if the fans work (air still comes out the vents), but it isn’t cold. This isn’t the only explanation of that, but it’s a good possible cause to check first.

Over time, with continual buildup, the motors will have to work too hard and will break down sooner than they should. And a broken motor isn’t something most people can fix themselves.Spring AC maintenance tips include cleaning debris from the unit, battery check, filter replacement

So follow this simple guide to Spring AC maintenance to avoid big repair costs:

  • Clean your filter
  • Change your filter if it’s dirty
  • Clean the unit of winter debris and any mold or filth that may have built up
  • Check the thermostat batteries – this is so often the problem! So simple to fix!

Another maintenance step is to lubricate certain moving parts. But again, knowing which parts need this and which ones do not requires more expertise than a typical homeowner has. If you’re not sure, you shouldn’t do this on your own.

And, depending on your physical abilities and willingness to get dirty, you might need to hire a professional to do some of these tasks. But doing this in the spring will ensure you make it through the summer heat wave with a working air conditioner.

What to Do If Your AC Doesn’t Start

If it doesn’t start, take action now so you can be sure you’ll have cool air in the hot weeks of summer.

Perform the maintenance tasks listed above or hire someone to come out and do them for you. Also, try re-setting your breaker switch. Wait for five minutes before turning it back on again. This will allow the system to reset.

If basic maintenance doesn’t fix the problem, then you probably have a more technically-specific flaw that requires more skill to fix.

What are possible problems causing your AC not to start?

  • Electrical problems – this is the most common cause. It could be a blown fuse or a breaker switch turned off. Could be the wiring in your thermostat
  • Broken compressor – the safety controls on most AC units won’t allow your system to start if the compressor is broken
  • Broken or clogged motors – again, the system can’t turn on without these crucial parts working right
  • Low coolant – could be leaking or just running low. If so, this is a major problem that needs immediate attention from a professional
  • Full condenser drain – if you know how to empty it, this is a good step to take. But again, this is a technically-proficient task that is best left to a professional

While most outdoor air conditioning units are built to withstand the weather, multiple periods of freezing and thawing, combined with lots of rain, debris, critters, and moisture, will have an effect over time.

So if your AC isn’t starting at all, you’ve tried resetting the breakers, and you’ve checked the thermostat batteries, then one of these culprits is likely the problem.

In that case, if you live in Snohomish county, Kirkland, Lynwood, Edmonds, Monroe, and the surrounding areas, schedule an appointment to have us come out and look at your AC. You can learn more about basic AC and furnace troubleshooting here.

Get on the schedule soon so you can be sure your AC will be fixed before summer – we fill up fast!

 

Schedule your AC repair appointment by contacting us