When we bought our house we knew the HVAC needed replaced, it is 22 years old (original to the house). It has made it through the first year of our ownership (minus 2 months) and we are trying to decide what to do.
The AWESOME news is that my brother-in-law owns his own HVAC company and has offered to put the new system in for us at cost and will be asking the manufacturer for a family discount on the unit itself (this is usually granted and should save us about 30% give or take). We don't have a quote, but if it is in the ballpark of what BIL says it will be it will be between $5-6k for a high efficiency unit, upgraded filtering system, whole home humidifier and possibly a UV light (cleans the air like in a hospital).
Since I'm currently out of work I did a huge favor for BIL and spent about 20 hours doing competitor intelligence (aka gathering quotes and evaluating the sales experience) for 7 of his competitors and the good companies all came in between $9-10k for the same thing so this is going to save us a TON of money!!!!!
The only stipulation for him doing the work at cost is that we can't do it in the summer or winter (busy season). If we don't do it before mid-May we would need to wait until October/November which is completely understandable. He is doing us a huge favor and I don't want this to be inconvenient for him and his crew.
We have a few options and I'm torn.
1) Do it now and pay cash (we have the cash on hand without touching our e-fund)
2) Do it now and pay mostly cash and do some 0% financing with BIL (not a personal loan, it would use the bank he offers all clients financing through)
3) Do it now and pay mostly cash and use some of our HELOC to pay the rest.
4) Put it off until fall and hope that the AC doesn't break down this summer.
I'm not currently working but all the unemployment I am receiving is going to be going into savings ($1,520/month after tax withholding). Our only debt is our mortgage and HELOC and we are able to meet all of our needs and some of our wants on DH's salary alone.
Going from our current system to a high efficiency system will save us between 35-40% of our heating and cooling costs so over time this will pay for itself.
ETA: We are not adverse to debt (especially no/low interest debt or a tax deductible interest payment like our HELOC) where it makes sense.
Re: What would MM do? (New HVAC)
My answer on when really depends on your climate. In RI, if our AC went out, we could get by with fans and window units for a summer. In the south, that's clearly not an option.
We ended up paying cash for our recent boiler upgrade, and though I don't exactly regret it, it was one of those "Murphy's Law" situations where right after doing so we had to touch our e-fund to replace H's car. It sounds like you guys are doing fine during your job search, but I might be more tempted to wait if you're in a northern climate, and consider low-interest financing if not. It's really a judgement call and I'm not sure there's a right answer beyond doing what you and H feel comfortable with.
MW made the mistake not replacing our furnace when she bought our house. It decided to fail mid-January and we had to replace the complete system. I know a lot of other people that had the same thing happen. The last thing you want is to be in the middle of upper 90's low 100's and 100% humidity and have the AC go out.
I would get the work done now if I were you. We had our unit break during 90-100 degree weather because we thought it would last us another season. What a miserable summer that was! And our cooling bill is half of what it used to be.
I'm also on the side of having the work done now. I realize things are tighter now that you are unemployed, but it sounds like there is a good handle on managing this expensive.
Another thought just to throw out there is, if you all decide to wait until Sept. and the A/C goes out in the middle of July, there are A/C window units as well as in-room A/C coolers that work really well. It would at least be a lower cost option to get through summer. You can get small ones for as cheap as $100 and decent sized ones that will cool multiple and/or large rooms for $400. Quite frankly, I live in NOLA and most people with the older 100-year-old+ houses (including myself) cool their homes with A/C window units.
On a different note, you all are making me a sad, sad panda.
I won a duplex in an auction earlier today (as an investment property), but have not been able to go inside the house yet. My DH and I suspect the main part of the HVACs have been stolen out of the house and we included that in our reno estimate...but at only $10K for a total replacement of both. Eeekk...I might have to double that.
I should hopefully be at the house with an inspector within the next couple days. I am going to be sending "rainbows and puppies" thoughts out to the cosmos that I will NOT be facing $20K, just for HVAC.
Alas, the house is in a newer part of NOLA where tenants will expect central a/c and heat.