How to Choose a Mini-Split for a NYC Home

What 25 years of HVAC work teaches about mini-splits in New York

Written by Igor Raickovic, owner and lead technician of Save Energy A/C Inc. and a Mitsubishi Diamond System Builder. Igor worked in HVAC in Europe for more than 20 years before bringing that experience to New York, where he still does the on-site estimates himself.

1. Size each room, not the whole apartment

A rule of thumb per square foot misses what matters in NYC: south and west windows, top floors under the roof, corner rooms and kitchens. A unit that is too big cools fast and shuts off before it removes humidity, so the room feels damp. A unit that is too small runs all day on the hottest and coldest days. We size room by room on the visit.

2. Decide where the outdoor unit goes first

The outdoor unit sets the rest of the job: how long the refrigerant lines are, where the drain runs, how loud it is for you and your neighbors, and whether the building will approve it. Roof, terrace, wall bracket or yard all work, but each has different rules and costs.

3. Plan where the water goes

Indoor units make condensate in summer, and in winter a heat pump's outdoor unit drains water when it defrosts. That water needs a planned path, so it does not drip on a terrace, a sidewalk or the neighbor below, or freeze where people walk.

4. Check the electrical side early

Older buildings can have limited electrical service to each apartment. Knowing what the system needs before the install avoids surprises on the day of the job.

5. For winter heat, choose a cold-climate model

If you want the system to heat, not only cool, pick a model the manufacturer rates for low outdoor temperatures, such as Mitsubishi Hyper-Heating (H2i), and check the rating in the spec sheet. In buildings with steam heat, the building heat usually stays and the heat pump adds comfort where you want it.

6. Compare brands by support and warranty

We work most with Mitsubishi, Daikin and Gree. Mitsubishi systems we install come with a 12-year manufacturer warranty, Daikin systems we install 7 years and Gree systems we install 5 years. Coverage and conditions are set by each manufacturer. Ask any installer which warranty applies to the exact system they quote.

7. Ask for an itemized written quote

A good quote lists the equipment by brand and model, the installation and line sets, wall and ceiling patching and painting, old unit removal if needed, and the timeline. If a quote is one number on one line, you cannot compare it.

8. Plan the upkeep

Clean the indoor filters as the owner's manual shows and have the system serviced at least once a year. A clean system uses less power and lasts longer.

Questions to ask any installer

• Who will come to the estimate, and who will do the install?
• Which exact equipment model is in the quote, and which warranty applies to it?
• Where will the outdoor unit, the lines and the drain go?
• What will you open in my walls or ceilings, and will you patch and paint?
• What does my building need from you before the work starts?

See also: common HVAC questions in NYC, ductless mini-split installation, heat pumps and PTAC replacement.