Extremes may cause no growth or spindly growth, foliage damage or loss, and even plant death. A good rule of thumb is to have night temperatures 10 to 15 degrees lower than day temperatures. During extreme outdoor weather, check the temperature near windows where you have plants. Keep plants away from heat registers, radiators, fireplaces or where the air conditioner causes drafts. Flowering plants are very sensitive to both warm and cool drafts.
Some plants require high humidity to survive.
For others, extra humidity is ideal, but they will survive at normal home humidity levels. A third group should have low humidity. For plants that require high humidity, the level in their vicinity must be raised. Most indoor humidity levels are not adequate for plants that require high humidity. Misting plants is not effective for raising humidity.