I also water houseplants with slightly warm water,, I think the cold water shocks them like it would us taking a bath in cold water
Anthuriums grow best with day temperatures of 78 to 90 F, and night temperatures of 70 to 75 F. Temperatures above 90 F may cause foliage burning, faded
flower color, and reduced
flower life.
Potting soil( medium)~
Anthuriums prefer a
growing media that is coarse and well drained. The potting media should be of a peat moss base with a 1:1:1 ratio of peat moss, pine bark and perlite. Plants when they are young should be planted in a mix that is not quite so coarse, to retain moisture. The soil should be settled firmly around the roots and the root system should fill the pot before the plant is stepped up to a larger pot size.
watering~
While Anthuriums are able to handle dryness around the root ball, they need to be watered thoroughly and allowed to dry slightly before watering again. Allowing the plant to dry out will greatly slow down the growth cycle. Drying out can also cause the tip to burn and root damage, while over watering can also cause root damage and sudden yellowing of leaves.
Light~
It sounds like you have your plant in the idea like,,,,,
Anthuriums as a rule (indoors) will take about as much light as you can provide them with-but not direct sunlight. Lower levels of light will slow down or cease
flower production. The foliage type species will tolerate lower light levels as they grow in some of the shadiest areas in their natural habitat. Leaves emerging under lower light may stretch and/or become distorted.
Fertilizer.
If you are going to fertilize, use a light solution of a 3:1:2 ratio and it is probably best to dilute to 1/4 strength. and begin in the
spring,, and never right after repotting,, give it time to adjust first.
Hope this helped