If you'd like a portable air conditioner that doubles as a space heater, owners recommend the NewAir AC-12000H. It's nearly identical to the well-regarded NewAir AC-12000E (Est. $460), except the AC-12000H can heat as well as cool a room of about 350 square feet. It has a built-in heat pump that uses the same out-the-window exhaust-hose setup as the air conditioner. Like the AC-12000E, it includes a remote control and 24-hour timer, as well as a self-evaporative system so you won't have to dump buckets of condensed water when using it as an air conditioner.
Most owner-reviewers say the NewAir AC-12000H heats and cools very well, although a few dissenters say it ran four hours and barely cooled their rooms at all. But as with most portable air conditioners, some complain that it's too loud, although others don't have a problem with the noise level.
Owner reviews posted at retail websites are the best source of feedback on portable air conditioners, including the NewAir AC-12000H. It gets plenty of reviews at Air-n-Water.com, and you can find additional feedback at Air-Conditioner-Home.com and Amazon.com.
The NewAir AC-12000H maintains a nearly 5-star rating with about 50 owner reviews posted here. Two owners say it ran for hours and barely cooled the room, but all others say it heats and cools well, although some say it's noisy.
Review: NewAir AC-12000H 12,000 BTU Heat Pump Portable Air Conditioner, Contributors to Air-n-Water.com
Only four owners have rated the NewAir AC-12000H here. Three give it high marks for cooling well (although one says it's noisy), but one irate customer says the seller shipped him a dusty, used air conditioner and then forced him to pay a $60 restocking fee plus shipping to return it.
Review: NewAir AC12000H 12,000 BTU Heat Pump Portable Air Conditioner with R410A Refrigerant, Contributors to Amazon.com
About 15 owners give the NewAir AC-12000H an overall rating of 4.6 out of 5 stars. Once more, reviewers say it cools well, but some think it's too loud.
Review: NewAir AC-12000H Portable Air Conditioner, Contributors to Air-Conditioner-Home.com