Let me be direct: if you're buying an HVAC system based on the lowest quote, you're probably making a mistake. I know because I've made that mistake, and it cost us more than the difference in price. For our office building, that 'cheaper' 3-ton Lennox air conditioner ended up being more expensive than the premium model we almost bought. I now calculate total cost of ownership (TCO) before comparing any vendor quotes.
Why I changed my approach
When I took over purchasing in 2020, my job was simple: get the lowest price. My boss, a numbers guy, wanted to see savings on paper. So I did what any responsible buyer would do—I got three quotes for a new compressor installation. The cheapest was about 15% less than the other two. It felt like a win.
Eight months later, that compressor failed. The manufacturer warranty covered the part, but labor wasn't included. We paid $1,200 out of pocket. The vendor who offered the 'cheap' quote? They couldn't send a technician for three weeks. We had to find an emergency contractor at double the rate. By the time we fixed it, we had lost two days of office productivity (roughly $4,000 in lost work time) and paid $1,800 in repair fees. The total cost of that 'cheap' compressor: $2,100 more than the quote. The premium quote? No issues at all.
Seeing those two scenarios side by side—a cheap quote that blew up vs. a higher quote that delivered—made me realize I had been looking at the wrong number.
Total cost is not just about the hardware
I now think about HVAC purchases in terms of three hidden cost categories:
- Installation and setup: Does the vendor include delivery, permits, start-up, and commissioning? Or are those billed separately? I've seen quotes where 'base price' didn't include a $400 crane rental for rooftop units.
- Operational costs: A higher SEER unit costs more upfront but uses less electricity. For a 3-ton Lennox air conditioner running 2,000 hours a year, a 16 SEER vs. 14 SEER model can save about $200-$300 annually in our climate zone. Over 15 years, that's $3,000-$4,500.
- Reliability and downtime: What happens when something breaks? Some brands or models have a reputation for fewer service calls. Lennox, for example, has a strong warranty on their compressors (10 years on most models), but the labor cost to replace a failed evaporator coil can still hit $1,500.
I used to ignore these. Now they're the first thing I ask about.
What about the Honeywell thermostat?
Recently, I had to reset a Honeywell thermostat that didn't have a physical reset button. (You know the type—the one where you hold down the 'menu' button for 20 seconds while praying.) That experience showed me how even small decisions—like which thermostat we install—affect maintenance costs. A contractor once told me, 'The cheapest thermostat is the most expensive one if you pay for a service call to program it.' He was right. We now standardize on models that our in-house team can configure easily.
In my first year, I made the classic specification error: assumed 'standard' meant the same thing to every vendor. I ordered a 'standard' evaporator coil for a Lennox system, but the vendor's idea of 'standard' was a different fin density. It caused airflow issues, and we had to swap it out. Cost us $800 in labor and materials. I now verify part numbers against Lennox's published specifications before ordering anything.
Addressing the obvious objection
I get it: budgets are tight. I've been there. When your boss says 'find the cheapest option,' it's not always easy to push back. But here's the thing: a few hundred dollars in 'savings' today can turn into thousands in repair costs, lost productivity, and vendor management headaches tomorrow.
To be fair, not every cheap vendor is bad. I've worked with some that delivered on time and with zero issues. But those vendors weren't the cheapest on paper—they were the most transparent about what was included and what wasn't. That transparency let me calculate the real cost before signing.
I'm not suggesting you always buy the most expensive option. That would be irresponsible. But I am saying that the lowest upfront price is rarely the lowest total cost. If you're making a decision on a 3-ton Lennox air conditioner, a compressor, or an evaporator coil—stop comparing unit prices. Ask the vendor for a breakdown of all costs: delivery, installation, labor warranty, and what happens if something fails in year two.
Take this with a grain of salt: I'm an administrative buyer, not an engineer. But I've processed 60+ HVAC orders over five years, and I've seen enough invoices to tell you this: the cost of 'cheap' is almost never a bargain. Calculate the total cost of ownership first. Your budget—and your VP—will thank you.
And if you're wondering how to reset that Honeywell thermostat without a button? Hold down the 'menu' and 'up arrow' buttons simultaneously for 10 seconds. Worked for me. Saved a $150 service call.
