When to replace HVAC equipment?

[Bert_]

Common flawed argument.

I've tested metal duct (no sealer) and seen 30% leakage. If it's installed poorly, leakage can be more.

Add airflow losses due to ****** fittings and connections and friction.

A 2000 cfm system with 20% leakage means that 400 cfm (approximately "1 ton" of airflow) is lost.

That air isn't in the ductwork going where it is supposed to.

Return leakage in an attic meant that the system is pulling 20-30% of hot and maybe humid air into the system and killing AC performance.

Same thing happens in heating season, and maintaining humidity may be impossible.

Duct leaking is bad.

Im not going to say it's not an issue but it's less of an issue. The OP is in Minnesota. Generally we have no ductwork in the attic.

 

[danski0224]

Im not going to say it's not an issue but it's less of an issue. The OP is in Minnesota. Generally we have no ductwork in the attic.

Attic... basement... in a slab...

Air leakage is not good and the ductwork should be installed to minimize leakage.

 

[Bert_]

Attic... basement... in a slab...

Air leakage is not good and the ductwork should be installed to minimize leakage.

In a basement there might be a register 5' away. I really don't want to sound like I don't care about leaks but I don't think it's worth obsessing about. Keep them to a minimum but I'm not going to try for zero. I don't even have any return ducting in my own house. Filter on the side of the furnace and a couple grates between the main floor and the basement.

In places where ductwork is ran in attics or similar spaces I would aim for zero.

 

[nh_yota]

Home warranties are a waste of money. They are popular because so many people are broke and simply don't have the cash socked away to cover home repairs regardless of whether they are expected or unexpected. I'm not wealthy by any stretch of the imagination but I have always set aside money for home repairs and sometimes I have enough extra to fund an improvement or two.

 

[Keith Bell]

When it comes to HVAC equipment, it is important to get a professional opinion from an expert. But, if you are not able to find one, there are some factors that you should consider before replacing your current HVAC equipment. HVAC contractors or technicians can help you with tips to maintain your air conditioner or furnace system throughout the year.

The first factor is the age of the unit. If your unit is too old, then it may be time for a replacement. The second factor is the size of the unit. If it is too small for your home, then a new one may be in order as well. The third factor would be if there have been any recent changes in your home or work environment that warrant a change in HVAC system size and type.

If you have an HVAC system installed in your home, you should know when it is time to replace it. HVAC equipment can be replaced anytime, but there are some signs that indicate that it is time to replace the equipment.
Signs that indicate the need for replacement include:
- The temperature of your home is fluctuating more than 10 degrees Fahrenheit.
- Your furnace or air conditioner makes a high-pitched noise.
- You smell gas.

There are many benefits of air conditioner repair & maintenance:
1. Better airflow.
2. Improved air quality indoors.
3. Lower energy costs.
4. Less wear and tear on the unit.

 

[jrsavoie]

I guess my opinion on this is assuming there is no problem with the existing equipment and it is already 90 plus efficiency, I wouldn't replace it.

If you wait, you may get another 5 or 10 years out of it. Furnaces that only run a few months a year and are properly maintained can last a long long time.

As far as an emergency replacement situation, that is where having "Your guy" can really be the difference. I've got that guy. He's the one who has done electrical work for me for years. He's the one that put the a/c system in my home addition. He's the guy I recommend to all my friends. If my furnace went out tomorrow I'm sure he'd come replace it for me ASAP.

The other thing I've got is a fireplace with a ventless log set, and another backup ventless heater in my family room. Even if my furnace went out, I'd be able to keep the house liveable through any conceivable cold snap.

So...to me having a solid relationship with an HVAC professional and some extra equipment you can lean on in a pinch, trumps replacing a good furnace just because it has some age on it.

Phil

I was my guy. LOL.

I have people I can call, but have always been sketchy about the tin work I see most installers do.

Insulation is still the best hvac money spent.

If you can come up with a plan B, I would run your equipment until it pukes.