David is a great tech. He knows products and will answer all questions to clients complete understanding. David goes beyond expected service requirements. Example: He noticed a heavy limb had fallen on a Japanese maple in side yard and removed limb before ever knocking on door. He provides helpful advice on maintenance of equipment such as replacing filter more often if running fan continuously. This is the type of person he is - just nice and thoughtful. Thank you Wall Heating and Air for your outstanding staff.
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