I have five kentias, three in the ground in full sunlight, having planted them a few years ago. The other two are on the northern exposure side of my house, and are very slow growing. The three in full sun did well for about a year or so, then suffered mightily from a rare, rare cold snap here in Ventura back in February. But all in all, they're making a great comeback, and I look forward to their beautifull umbrella-like fronds restoring fully by next spring. I have over thirty palms, a few cycads, and a few ferns (Aussie Tree, Tasmanian, Meyers, etc, and the battle seems to be that, when growing tropical plants at 34 degrees north and beyond, one has to remember to be patient; this is not their home environment. They will grow slower, suffer setbacks, and generally be less vigorous as they slowly adapt to their new climate. Light level is very important, for in equatorial climes, the sun is almost directly overhead year round; thus the symmetry most tropical plants exhibit. And watering there is a daily thing - even the so-called "dry season" brings at least light rain each day. And so, consider that a palm or cycad or fern is being asked a lot when planting this far (or further) north - a good soaking once a week or so during summer, then back off during winter months, when most tropical plants nearly "shut down". All sorts of blogs have been posted, but it all comes down to this: Every plant on Earth has one thing in common - the roots seek water. Therefore, when planting or potting, always remember to put a good layer of sand beneath the root ball, and around it with about a 50/50 mix of sand and Cactus Mix around the sides of the planting hole when filling. Watering will thus suround the roots and leach downward and beyond the lower portions of the roots through the sand, causing the roots to "seek" the water below, establishing in not to much time a healthy root system.

Personally, I doubt it is "heated, dry air" causing the problem since it is not yet the heating season. Sounds like it could be in shock, or perhaps an error in watering. Do NOT keep the palm constantly wet. I allow mine to dry completely before a thorough watering. NEVER allow your Kentia to sit fro a prolonged period in a saucer of water. Most palms can't stand "wet feet", although you might get away with wet feet for a Majesty Palm, but they are harder to keep happy than most Kentias. Do NOT repot now unless you have reason to think your palm is rootbound in its present pot. I just repotted mine because it was pushing up out of its pot.

Really hard to overwater one of these as long as you have really well draining soil in a really well draining pot. Check the soil 1/2 day after you water... it should feel only barely damp, not sloggy... if it's still soaking wet, you have a drainage problem. You need to fix that so water really pours out the holes in the bottom when you water this palm... these palms however, are amazingly drought tolerant... I have forgotten to water mine sometimes for over a month and they show little damage from that abuse (indoors.. outdoors they suffer a bit more since they dry out faster). that's one of the reasons these make such good indoor palms... very tolerant of a wide range of conditions. Low light, high light, dry, moist etc. .. .but not sloggy soils.. they will start to rot then. So, If your pot drains super well and your soils are nice and really well draining, you can safely water this palm daily to weekly... should do fine either way... may grow faster the more you water it, though. Every few months you need to really water it well- take it outdoors and water the heck out of it over and over again- this is rinse out the accumulated salts that tend to build up in the soil in potted plants. Heavy salt build ups are really hard on palm roots.

WATER AND MORE WATER! They should have been kept soaking wet from the day they were planted. It wouldn't stop some sunburn- but would have mitigated the damage. For the Howeas its going to be a slow recovery- years. The King palms are much faster..but the browned trunk worries me. That's a deep burn. I know it sounds like you watered often enough...but probably not enough or deep enough. A watering ring around those palms filled when watered and then re filled would help. You might as well cut off the dead fronds and start from there. Those are some of the best palms to grow..but the start can sometimes get off on the wrong foot in a hot summer. You might be happier to add more palms alongside now that temps will be going down so you have something nice to look at for now. It would be worth it instead of getting all frustrated waiting for those to recover. Best luck!