Some common signs that you may be experiencing excessive dryness of hardwood floor or humidity include:

Excessive dryness of hardwood floor:
• First,gapping or cracking between wood planks. Wood planks shrinking and pulling apart due to low humidity.
• Also,squeaking or popping noises when walking. Boards contracting and expanding rapidly with each footstep.
• Visible cupping or warping of wood planks. The outer edge of wood planks curling upward from lack of moisture.
• Next,rough, splintery feel. Allowing the wood to become overly dry leads to a rough, splintery surface.
• In addition,dull, faded appearance. Finish becoming dull and wood tones looking faded or washed out. Moisture provides wood with an attractive glow.
• Furthermore,blistering or peeling. Extreme dryness can cause wood veneers or laminates to blister or peel away from core materials.
Excessive humidity:
• First,swelling of wood planks. Excessive moisture causes wood to swell, pushing planks apart at joints and causing bulges in the floor surface.
• Then,sticky, tacky surface. High humidity prevents proper drying of wood finishes and creates a sticky, tacky feel. Burns or blisters can result.
• Also,buckling or warped wood. Exposure to prolonged high humidity and moisture can cause the wood to buckle upward or warp in shape. Floors become uneven and can be a tripping hazard.
• Then,mold . High humidity and lack of air circulation provides an ideal environment for mold and mildew growth, presenting health issues.
• In addition,fading or discoloration. Finish and wood tones in damp areas will appear faded, dull or discolored. Water exposure leads to a dingy, unattractive look.
• Moreover,peeling or popping joints. Wood joints absorb excess moisture and expand or buckle out of place, leading to separations and peeling joints.
• Finally,Musty smells. Excessive moisture results in musty, unpleasant smells from wood rot, mold and bacteria growth. Proper drying and ventilation helps eliminate musty odors.
In conclusion,the solution for both excessive dryness and humidity is stabilizing the indoor environment to provide moderate, consistent humidity levels around 40-50%. Use humidifiers, dehumidifiers, air filtration and moisture-resistant finishes as needed to create ideal conditions for hardwood floor health.