Plain version: this is the checklist I use when a purchase request lands on my desk for something that heats, cools, or dehumidifies a space. I'm a procurement manager at a 40-person aluminum fabrication shop. I've managed roughly $180,000 in climate-equipment spending over six years, and I've compared quotes from a lot of vendors. I'm not an HVAC engineer. I'm the person who makes sure the engineers and owners don't get blindsided by costs.

This checklist applies if you're about to buy a Dimplex EverDri 20L dehumidifier, compare a Dimplex linear convector baseboard heater, pick a garage heater, or answer the question 'what is a chiller?' Nothing here is a substitute for a licensed contractor. But it will save you money if you actually follow the steps in order.

1. Name the Problem Before You Name the Product

I get requests like 'we need a dehumidifier' or 'we need to cool the laser room.' The first thing I ask back is 'why?'

That sounds obvious, but it's ignored more than you'd expect. A dehumidifier removes water from the air. It doesn't fix a cold draft. A fan moves air. It doesn't lower humidity. And a chiller is not the same as an air conditioner.

What is a chiller? A chiller is a refrigeration machine that cools a liquid, usually water or a water-glycol mix. That cooled liquid then removes heat from air or equipment through a heat exchanger. ASHRAE terminology describes it as the source of chilled water for a cooling system.

If you don't know the actual problem, you can't know whether to buy a chiller, a dehumidifier, or a ninety-dollar fan. We keep a Ryobi fan with a long extension cord in the maintenance aisle as a 'try this first' tool. For a spot-cooling complaint, that fan solved a surprising number of issues and saved a ton of money.

2. Price the Install, Not Just the Unit

The quiet killer in climate-equipment budgets is installation cost. A Dimplex linear convector baseboard heater may be a reasonable item in a catalog, but the full cost includes the wall thermostat, wiring, labor, and sometimes a new circuit. I've seen a $350 heater turn into a $1,100 installed system when the panel had no open breaker.

That doesn't mean baseboard heat is a bad choice. It means you should ask for an installed quote before you talk about unit price. The same goes for a garage heater. The heater itself might be $700, but if your panel can't handle a 240V load, that electrical upgrade is a separate line item.

When I compare quotes, I use a simple TCO spreadsheet. Columns: equipment, shipping, taxes, electrical work, mounting, controls, commissioning, and waste removal. If a quote uses the word 'free setup,' I look for what's not in it. That 'free setup' offer cost us $450 in hidden fees once, and now it's a red flag.

3. Read the Fine Print on Performance Ratings

This is the step most people skip, and it's the one that costs the most later.

Take the Dimplex EverDri 20L dehumidifier. The '20L' means 20 liters per day under a specific set of conditions. Most dehumidifier ratings come from tests run by AHAM or other labs at controlled temperature and humidity. If you put that unit in a 55°F basement, it won't pull 20 liters a day. It might pull half that. That changes the whole cost picture.

Per AHAM's dehumidifier testing standard, capacity is measured in a controlled chamber, not in a real basement. That's why the label numbers and your real-world numbers can be very different. Before you buy any dehumidifier, ask for the rated capacity at the temperature and humidity you actually have. Also check the low-temperature operating range. A unit that shuts off below 41°F is useless in an unheated storage area.

4. Do the Energy Math Before You Compare Purchase Prices

Purchase price is a down payment. Electricity is the monthly payment.

Let's start with garage heaters because they're so easy to mis-budget. A 1,500W electric heater is about 5,100 BTU/h. A 5,000W unit is about 17,000 BTU/h. If you need a bigger garage heater, you're not just buying more watts; you're paying for them every time it runs.

As of January 2025, I use $0.18/kWh as a planning number in our area. A 5,000W heater running 4 hours a day costs about 20 kWh per day, which is $3.60. Over a 30-day month, that's $108. That's a real line item, not a rounding error.

For cooling, energy math is the same. A fan that moves air across your body can make a room feel cooler without cooling the air. That's why the Ryobi fan gets used before we call an HVAC contractor. Cheaper to buy, cheaper to run, and it solves a lot of complaints. It isn't a chiller, and it won't handle a process heat load, but it doesn't pretend to.

5. Compare Like-for-Like Quotes and Check Scope

Vendor quotes are not comparable if they include different scope. I compare the final installed system, not the price on the product.

One vendor might quote a Dimplex linear convector baseboard heater with a programmer thermostat. Another vendor quotes a heater but leaves out the thermostat because 'you probably have one.' That's not a cheaper price; it's an incomplete quote.

The other thing I watch for is how the vendor treats a small first order. When I was starting out, the vendors who treated my $200 orders seriously are the ones I still use for $20,000 orders. Small doesn't mean unimportant—it means potential. One of our long-term suppliers agreed to quote a $300 order and asked two smart questions about the installation. They got the $18,000 follow-up order. A vendor who treats small orders as a nuisance loses the bigger opportunity.

6. Check Service, Spare Parts, and Warranty Before You Sign

A heater or dehumidifier might last years with no service. A chiller won't. It has a compressor, refrigerant, pumps, and controls. If you're asking 'what is a chiller,' you're probably not ready to buy one without a service contractor nearby. That's not a criticism; it's just a cost reality.

For Dimplex products, I like checking whether replacement elements, thermostat interfaces, and fan motors are available from normal distributors. If a brand is easy to source in your region, it's easier to get spare parts during a failure.

Read the warranty's fine print. Some warranties require a licensed installer. Others require registration within 30 days. If you miss that deadline, you've turned a 10-year warranty into a 1-year one.

7. Make the Decision on Paper, Not on Sales Calls

The conventional wisdom is to always get three quotes. My experience with hundreds of orders is that more important than the number of quotes is the completeness of each quote. I've built a cost calculator over the years because I got burned on hidden fees twice. Now every purchase has a one-page summary: the options, the installed cost, the monthly energy cost, and the service risk.

I also write down the assumption. For a dehumidifier, that means the space temperature and humidity. For a garage heater, it means insulation level and ceiling height. For a chiller, it means flow rate, entering water temperature, and leaving water temperature. Without that, 'what is a chiller' is the wrong question. The right question is 'what conditions does my building require?'

As of January 2025, this is the process I still use. Prices and models change, so verify the current specs before you budget. The checklist is the same.

Common Mistakes I See After the Purchase

Most of these show up when the unit is already on the dock. Easier to avoid them earlier.

  • Buying a 20L dehumidifier without checking the room's actual temperature and humidity. The Dimplex EverDri 20L can be a solid choice in the right room, and an underperformer in the wrong one.
  • Comparing a Dimplex linear convector baseboard heater to a forced-air unit with no mention of ductwork. Installation is the tiebreaker.
  • Ordering a chiller before defining the load and water temperatures. That's how you end up with a machine that's too big or too small.
  • Forgetting that a garage heater may need a dedicated 240V circuit. Electricians charge for that.
  • Buying a 'cheap' fan because it looks similar to a Ryobi fan but has no replacement parts. The copy is not the same.

That's the whole list. It's not exciting, but it has kept a lot of procurement decisions from becoming expensive adventures.