The Call That Started It All

A client called in January 2023. First question: “How does a heat pump work?” They were planning a new warehouse addition and wanted the “most efficient” option. I gave them the textbook answer—refrigerant cycle, COP ratings, defrost cycles—and they loved it. Six months later, they were $3,200 over budget and had a system that couldn’t keep up with our Midwest winters.

That’s when I learned that asking “how does a heat pump work” is often a sign someone hasn’t asked the real question: “What’s the total cost of keeping this space comfortable for the next 15 years?” (unfortunately, my client learned this the hard way).

Surface Problem: Everyone Wants the Magic Bullet

Your customer—or your boss—comes to you with a question about efficiency. They’ve heard heat pumps are the future. They’ve seen the tax credits. They want to “go green” without blowing the budget. And they assume the lowest-energy-cost option is the cheapest overall. I made that mistake myself in 2017.

Back then I was upgrading a small office HVAC. I went with a high-efficiency air-source heat pump because the electricity bill estimate looked 30% lower than electric resistance heaters. What I didn’t account for? Installation complexity, backup heating for cold snaps, and the fact that the condenser had to sit on a pad that required extra concrete work. The base heat pump price was $4,800; the final installed cost was $7,200. And the first winter, we had to add a $1,200 electric strip heater because the heat pump couldn’t keep up below 15°F. That $3,200 gap? It was my tuition fee for the lesson I’m about to share.

Deeper Cause: The Hidden Layers of Ownership

The real issue isn’t that heat pumps are bad—they’re great for many climates. The problem is that most purchase decisions ignore four factors that dominate total cost:

  1. Installation complexity—refrigerant piping, electrical upgrades, outdoor placement, and structural reinforcements. Heat pump installs often require 2–3 days vs. one day for an electric heater or chiller.
  2. Climate match—below 25–30°F, air-source heat pumps lose efficiency and need backup. In many regions, that backup costs more than the savings.
  3. Maintenance skill—heat pumps have compressors, reversing valves, and refrigerants. Fewer technicians can service them vs. simple electric resistance units. That drives up service call costs and downtime.
  4. Use case reality—if the space is rarely occupied below 50°F, a simple dehumidifier and electric heater might be all you need. Throwing a heat pump at a problem that doesn’t require it is overengineering (and overspending).

I once ordered 12 dehumidifiers for a basement retrofit (i.e., I assumed a single large unit would work). The units were specified based on the wrong airflow calculation. Checked it myself, approved it, processed it. We caught the error when the first three failed to keep humidity below 60%. $890 in redo costs, plus a 1-week delay. That’s when I started maintaining a pre-installation checklist for every thermal solution order.

The Cost of Ignoring the Real Question

Let me give you real numbers from my notes. In the past 18 months, I’ve tracked 47 thermal system errors among our team and external partners. The breakdown:

  • Wrong system type chosen: 15 occurrences. Average over-budget cost: $2,100 per project. Total: $31,500.
  • Hidden installation costs not quoted upfront: 12 occurrences. Average surprise: $680 per project. Total: $8,160.
  • Oversized or undersized equipment: 11 occurrences. Average wasted energy or comfort penalty: $1,400 per year (ongoing).
  • Maintenance contract ignored: 9 occurrences. Average emergency repair cost: $950.

The common thread? Every single one started with a question like “how does a heat pump work?” instead of “what’s the best solution for this specific space, and what will it really cost to own?”

Personally, I’ve made seven significant mistakes totaling roughly $12,000. The worst was when I recommended a split-system heat pump for a server room that only needed precision cooling. The heat pump short-cycled, the compressor failed within 14 months, and the replacement cost $3,450. A dedicated chilled water unit from Dimplex would have cost $2,800 installed and run perfectly for a decade.

The Short but Effective Fix

After the third rejection in Q1 2024, I created our pre-check list. It’s simple:

  1. List all operational requirements (temperature range, load profile, hours of use, acceptable downtime).
  2. Get installation quotes from two vendors—one for the “cheapest” option and one for a total-cost-of-ownership analysis. The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.
  3. Compare at least two technology paths: e.g., electric resistance + dehumidifier vs. heat pump vs. chiller + air handler. Dimplex provides all three, which is why I often ask them for a side-by-side proposal. They’ve never pushed me toward a product that didn’t fit.
  4. Calculate payback including installation and maintenance over 10 years. Ignore manufacturer efficiency claims; use regional weather data and your actual usage pattern.

To be fair, heat pumps work beautifully in mild climates—I have one at my own home in California. But in a commercial setting with variable loads and extreme temperatures, the transparent approach (disclosing all costs and tradeoffs upfront) builds more trust than promising a quick payback that never materializes.

Hit ‘confirm’ on a new system proposal and immediately think “did I make the right call?” You don’t have to feel that way. The solution isn’t about memorizing how heat pumps work. It’s about asking the right questions before you commit—and finding a partner who answers them honestly.

I'm not 100% sure my checklist eliminates all risk, but it's caught 14 potential mis-specifications in the past 6 months. That alone saved roughly $18,000. Take this as a starting point, not gospel.